diff --git a/config.yaml.example b/config.yaml.example
index c247004..fc6b41a 100644
--- a/config.yaml.example
+++ b/config.yaml.example
@@ -315,7 +315,7 @@ tools:
 #   secure_cookie: false                      # HTTPS 環境では true
 #   admin_emails:
 #     - "admin@example.com"
-#   # primary_provider: gitea                 # 'google' | 'gitea'。両方有効時に明示
+#   # primary_provider: gitea                 # 'google' | 'gitea' | 'local'。複数有効時に明示
 #   providers:
 #     google:
 #       client_id: ""
@@ -326,6 +326,15 @@ tools:
 #       client_secret: ""
 #       base_url: "https://gitea.example.com"
 #       callback_url: "http://localhost:3000/auth/gitea/callback"
+#   # ローカルアカウント (email + password)。OAuth を立てずにパスワード保護したい時。
+#   # 既存の no-auth デプロイに後付け可: 起動時に bootstrap_admin を id='local' で冪等 seed し、
+#   # no-auth 時代に 'local' 所有で溜まったデータをそのまま admin が引き継ぐ。
+#   local:
+#     enabled: true
+#     allow_signup: false                     # true でセルフ登録 (status=pending → admin 承認)
+#     bootstrap_admin:                        # 初回 admin (id='local')。seed 後は Settings/CLI で変更
+#       email: "admin@example.com"
+#       password: "強いパスワードを設定"        # 平文保存される。初回ログイン後に変更推奨
 
 # ─── Branding (オプション) ────────────────────────────────────
 # config.yaml / data/branding/ は .gitignore 済みで git pull 影響なし。
diff --git a/src/bridge/admin-api.local.test.ts b/src/bridge/admin-api.local.test.ts
new file mode 100644
index 0000000..d3116de
--- /dev/null
+++ b/src/bridge/admin-api.local.test.ts
@@ -0,0 +1,145 @@
+/**
+ * Admin user-management with local accounts: create, password reset, and the
+ * deletion path (folder removal + local-user guard).
+ *
+ * Uses a real admin session (request.agent cookie jar) so requireAdmin passes.
+ * See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+import { afterAll, beforeAll, describe, it, expect } from 'vitest';
+import { mkdtempSync, rmSync, existsSync, writeFileSync } from 'fs';
+import { join } from 'path';
+import { tmpdir } from 'os';
+import express, { type Express } from 'express';
+import request from 'supertest';
+import { Repository } from '../db/repository.js';
+import { runMigrations } from '../db/migrate.js';
+import { setupAuth, requireAuth, buildChangePasswordHandler } from './auth.js';
+import { mountAdminApi } from './admin-api.js';
+import { ensureUserFolder } from '../user-folder/paths.js';
+import type { AuthConfig } from '../config.js';
+
+const AUTH: AuthConfig = {
+  sessionSecret: 'test', sessionMaxAge: 3600_000, secureCookie: false,
+  adminEmails: [], providers: {}, local: { enabled: true },
+};
+
+describe('admin-api local user management', () => {
+  let tempDir = '';
+  let userFolderRoot = '';
+  let repo: Repository;
+  let app: Express;
+
+  // setupAuth ONCE per file: passport.serializeUser/deserializeUser register
+  // onto a stack (they don't replace), so calling setupAuth per-test would
+  // leave earlier tests' deserializers (bound to closed repos) running first.
+  // The server only ever calls setupAuth once, so this mirrors production.
+  beforeAll(() => {
+    tempDir = mkdtempSync(join(tmpdir(), 'maestro-adminlocal-'));
+    userFolderRoot = join(tempDir, 'users');
+    repo = new Repository(join(tempDir, 'orchestrator.db'));
+    runMigrations(repo.getDb());
+    repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'adminpw12' });
+
+    app = express();
+    const auth = setupAuth(repo, AUTH);
+    app.use(auth.sessionMiddleware);
+    app.use(auth.passportInit);
+    app.use(auth.passportSession);
+    app.use('/auth', auth.authRouter);
+    app.use('/api/admin', express.json());
+    mountAdminApi(app, repo, true, userFolderRoot);
+    // Self-service password change (mounted the same way server.ts does).
+    app.post('/api/auth/password', requireAuth, express.json(), buildChangePasswordHandler(repo));
+  });
+  afterAll(() => {
+    repo.close();
+    if (tempDir) { rmSync(tempDir, { recursive: true, force: true }); tempDir = ''; }
+  });
+
+  async function adminAgent() {
+    const agent = request.agent(app);
+    await agent.post('/auth/local').type('form').send({ email: 'admin@x.com', password: 'adminpw12' });
+    return agent;
+  }
+
+  it('POST creates a local user (active) that can authenticate', async () => {
+    const agent = await adminAgent();
+    const res = await agent.post('/api/admin/users').send({ email: 'bob@x.com', password: 'bobpw1234' });
+    expect(res.status).toBe(201);
+    const u = repo.getUserByEmail('bob@x.com')!;
+    expect(u.status).toBe('active');
+    expect(repo.verifyLocalPassword(u.id, 'bobpw1234')).toBe(true);
+  });
+
+  it('POST rejects a duplicate email (409)', async () => {
+    const agent = await adminAgent();
+    await agent.post('/api/admin/users').send({ email: 'dup@x.com', password: 'pw123456' });
+    const res = await agent.post('/api/admin/users').send({ email: 'dup@x.com', password: 'other123' });
+    expect(res.status).toBe(409);
+  });
+
+  it('POST .../password resets the password', async () => {
+    const agent = await adminAgent();
+    const u = repo.createLocalUser({ email: 'carol@x.com', password: 'oldpw1234', role: 'user', status: 'active' });
+    const res = await agent.post(`/api/admin/users/${u.id}/password`).send({ password: 'newpw1234' });
+    expect(res.status).toBe(204);
+    expect(repo.verifyLocalPassword(u.id, 'oldpw1234')).toBe(false);
+    expect(repo.verifyLocalPassword(u.id, 'newpw1234')).toBe(true);
+  });
+
+  it('DELETE removes the user AND their on-disk folder', async () => {
+    const agent = await adminAgent();
+    const u = repo.createLocalUser({ email: 'dave@x.com', password: 'davepw12', role: 'user', status: 'active' });
+    const dir = ensureUserFolder(userFolderRoot, u.id);
+    writeFileSync(join(dir, 'notes', 'secret.md'), 'data');
+    expect(existsSync(dir)).toBe(true);
+
+    const res = await agent.delete(`/api/admin/users/${u.id}`);
+    expect(res.status).toBe(204);
+    expect(repo.getUserById(u.id)).toBeNull();
+    expect(existsSync(dir)).toBe(false); // folder gone, no orphan
+  });
+
+  it('DELETE refuses the local/system user (400) and preserves it + its folder', async () => {
+    const agent = await adminAgent();
+    const dir = ensureUserFolder(userFolderRoot, 'local');
+    const res = await agent.delete('/api/admin/users/local');
+    expect(res.status).toBe(400);
+    expect(repo.getUserById('local')).not.toBeNull();
+    expect(existsSync(dir)).toBe(true);
+  });
+
+  it('mutations require an admin session (401/403 without login)', async () => {
+    const res = await request(app).delete('/api/admin/users/whoever');
+    expect([401, 403]).toContain(res.status);
+  });
+
+  // ── self-service password change ──────────────────────────────
+
+  it('POST /api/auth/password changes own password with the correct current one', async () => {
+    const agent = await adminAgent(); // logged in as the local admin (pw adminpw12)
+    const res = await agent.post('/api/auth/password').send({ currentPassword: 'adminpw12', newPassword: 'brandnewpw1' });
+    expect(res.status).toBe(204);
+    expect(repo.verifyLocalPassword('local', 'brandnewpw1')).toBe(true);
+    // restore so later assumptions about the admin password hold
+    repo.setLocalPassword('local', 'adminpw12');
+  });
+
+  it('POST /api/auth/password rejects a wrong current password (403)', async () => {
+    const agent = await adminAgent();
+    const res = await agent.post('/api/auth/password').send({ currentPassword: 'WRONG', newPassword: 'whatever123' });
+    expect(res.status).toBe(403);
+    expect(repo.verifyLocalPassword('local', 'adminpw12')).toBe(true); // unchanged
+  });
+
+  it('POST /api/auth/password rejects a too-short new password (400)', async () => {
+    const agent = await adminAgent();
+    const res = await agent.post('/api/auth/password').send({ currentPassword: 'adminpw12', newPassword: 'short' });
+    expect(res.status).toBe(400);
+  });
+
+  it('POST /api/auth/password requires authentication (401/403)', async () => {
+    const res = await request(app).post('/api/auth/password').send({ currentPassword: 'x', newPassword: 'yyyyyyyy' });
+    expect([401, 403]).toContain(res.status);
+  });
+});
diff --git a/src/bridge/admin-api.ts b/src/bridge/admin-api.ts
index b65692d..3ac27fc 100644
--- a/src/bridge/admin-api.ts
+++ b/src/bridge/admin-api.ts
@@ -1,10 +1,16 @@
 import { type Application, type Request, type Response, type RequestHandler } from 'express';
 import type { Repository } from '../db/repository.js';
 import { requireAdmin } from './auth.js';
+import { deleteUserFolder } from '../user-folder/paths.js';
 
 const passthrough: RequestHandler = (_req, _res, next) => next();
 
-export function mountAdminApi(app: Application, repo: Repository, authActive = true): void {
+export function mountAdminApi(
+  app: Application,
+  repo: Repository,
+  authActive = true,
+  userFolderRoot = './data/users',
+): void {
   const guard = authActive ? requireAdmin : passthrough;
 
   app.get('/api/admin/users', guard, (_req: Request, res: Response) => {
@@ -12,10 +18,45 @@ export function mountAdminApi(app: Application, repo: Repository, authActive = t
     const enriched = users.map(u => ({
       ...u,
       orgs: repo.listUserGiteaOrgs(u.id),
+      hasLocalPassword: repo.hasLocalCredential(u.id),
     }));
     res.json(enriched);
   });
 
+  // Create a local (email + password) account. Admin-created accounts are
+  // pre-approved (status=active). Rejects an email that already exists.
+  app.post('/api/admin/users', guard, (req: Request, res: Response) => {
+    if (!authActive) { res.status(403).json({ error: 'Auth is not configured' }); return; }
+    const { email, password, role } = (req.body ?? {}) as { email?: string; password?: string; role?: string };
+    if (typeof email !== 'string' || !email.trim() || typeof password !== 'string' || password.length < 8) {
+      res.status(400).json({ error: 'email and a password of at least 8 characters are required' });
+      return;
+    }
+    const wantRole = role === 'admin' ? 'admin' : 'user';
+    try {
+      const user = repo.createLocalUser({ email: email.trim(), password, role: wantRole, status: 'active' });
+      res.status(201).json(user);
+    } catch {
+      res.status(409).json({ error: 'a user with that email already exists' });
+    }
+  });
+
+  // Reset (or set) a user's local password. Invalidates their sessions so the
+  // new password must be used.
+  app.post('/api/admin/users/:id/password', guard, (req: Request, res: Response) => {
+    if (!authActive) { res.status(403).json({ error: 'Auth is not configured' }); return; }
+    const { id } = req.params;
+    const { password } = (req.body ?? {}) as { password?: string };
+    if (typeof password !== 'string' || password.length < 8) {
+      res.status(400).json({ error: 'password must be at least 8 characters' });
+      return;
+    }
+    if (!repo.getUserById(id)) { res.status(404).json({ error: 'User not found' }); return; }
+    repo.setLocalPassword(id, password);
+    repo.deleteSessionsByUserId(id);
+    res.status(204).end();
+  });
+
   app.patch('/api/admin/users/:id', guard, (req: Request, res: Response) => {
     if (!authActive) { res.status(403).json({ error: 'Auth is not configured' }); return; }
     const { id } = req.params;
@@ -39,6 +80,12 @@ export function mountAdminApi(app: Application, repo: Repository, authActive = t
   app.delete('/api/admin/users/:id', guard, (req: Request, res: Response) => {
     if (!authActive) { res.status(403).json({ error: 'Auth is not configured' }); return; }
     const { id } = req.params;
+    // The shared `local` system/admin user is the no-auth fallback owner and
+    // owns all single-user-mode data — never deletable.
+    if (id === 'local') {
+      res.status(400).json({ error: 'the local/system user cannot be deleted' });
+      return;
+    }
     const user = repo.getUserById(id);
     if (!user) {
       res.status(404).json({ error: 'User not found' });
@@ -46,6 +93,9 @@ export function mountAdminApi(app: Application, repo: Repository, authActive = t
     }
     repo.deleteSessionsByUserId(id);
     repo.deleteUser(id);
+    // Remove the on-disk user folder too — the DB cascade only handles rows.
+    // Without this the user's scripts/macros/recordings/notes orphaned on disk.
+    deleteUserFolder(userFolderRoot, id);
     res.status(204).end();
   });
 }
diff --git a/src/bridge/auth-login.html b/src/bridge/auth-login.html
index 634c2a0..4ed20f2 100644
--- a/src/bridge/auth-login.html
+++ b/src/bridge/auth-login.html
@@ -325,6 +325,33 @@
         </a>
         <!-- GITEA_BUTTON_END -->
 
+        <!-- LOCAL_FORM_START -->
+        <!-- LOCAL_DIVIDER_START -->
+        <div class="divider">または</div>
+        <!-- LOCAL_DIVIDER_END -->
+        <form method="post" action="/auth/local" style="display:flex;flex-direction:column;gap:10px;margin-bottom:8px;">
+          <input type="email" name="email" placeholder="メールアドレス" required autocomplete="username"
+                 style="padding:11px 12px;border:1px solid #d0d5dd;border-radius:8px;font-size:14px;width:100%;box-sizing:border-box;">
+          <input type="password" name="password" placeholder="パスワード" required autocomplete="current-password"
+                 style="padding:11px 12px;border:1px solid #d0d5dd;border-radius:8px;font-size:14px;width:100%;box-sizing:border-box;">
+          <button type="submit" class="oauth-button" style="justify-content:center;background:#111827;color:#fff;border:none;cursor:pointer;">
+            メールアドレスでログイン
+          </button>
+        </form>
+        <!-- LOCAL_SIGNUP_START -->
+        <div class="divider">アカウントが無い場合</div>
+        <form method="post" action="/auth/local/signup" style="display:flex;flex-direction:column;gap:10px;">
+          <input type="email" name="email" placeholder="メールアドレス" required autocomplete="username"
+                 style="padding:11px 12px;border:1px solid #d0d5dd;border-radius:8px;font-size:14px;width:100%;box-sizing:border-box;">
+          <input type="password" name="password" placeholder="パスワード（8文字以上）" minlength="8" required autocomplete="new-password"
+                 style="padding:11px 12px;border:1px solid #d0d5dd;border-radius:8px;font-size:14px;width:100%;box-sizing:border-box;">
+          <button type="submit" class="oauth-button" style="justify-content:center;background:#fff;color:#111827;border:1px solid #d0d5dd;cursor:pointer;">
+            新規登録（管理者の承認後に利用可）
+          </button>
+        </form>
+        <!-- LOCAL_SIGNUP_END -->
+        <!-- LOCAL_FORM_END -->
+
         <p class="footer-note">
           ログインすることで、利用規約とプライバシーポリシーに<br>同意したものとみなされます。
         </p>
diff --git a/src/bridge/auth.local.test.ts b/src/bridge/auth.local.test.ts
new file mode 100644
index 0000000..dd9b050
--- /dev/null
+++ b/src/bridge/auth.local.test.ts
@@ -0,0 +1,137 @@
+/**
+ * Local-auth HTTP routes + helpers: login, self-signup, login-page rendering,
+ * and the primary=local provider gating.
+ *
+ * See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+import { afterEach, beforeEach, describe, it, expect } from 'vitest';
+import { mkdtempSync, rmSync } from 'fs';
+import { join } from 'path';
+import { tmpdir } from 'os';
+import express, { type Express } from 'express';
+import request from 'supertest';
+import { Repository } from '../db/repository.js';
+import { runMigrations } from '../db/migrate.js';
+import { setupAuth, isLocalEnabled, isProviderActive } from './auth.js';
+import type { AuthConfig } from '../config.js';
+
+function mkAuthConfig(over: Partial<AuthConfig> = {}): AuthConfig {
+  return {
+    sessionSecret: 'test-secret',
+    sessionMaxAge: 3600_000,
+    secureCookie: false,
+    adminEmails: [],
+    providers: {},
+    local: { enabled: true, allowSignup: true },
+    ...over,
+  };
+}
+
+function mkApp(repo: Repository, authConfig: AuthConfig): Express {
+  const app = express();
+  const auth = setupAuth(repo, authConfig);
+  app.use(auth.sessionMiddleware);
+  app.use(auth.passportInit);
+  app.use(auth.passportSession);
+  app.use('/auth', auth.authRouter);
+  app.get('/', (_req, res) => res.send('home'));
+  return app;
+}
+
+describe('isLocalEnabled', () => {
+  it('reflects auth.local.enabled', () => {
+    expect(isLocalEnabled(mkAuthConfig({ local: { enabled: true } }))).toBe(true);
+    expect(isLocalEnabled(mkAuthConfig({ local: { enabled: false } }))).toBe(false);
+    expect(isLocalEnabled(mkAuthConfig({ local: undefined }))).toBe(false);
+  });
+});
+
+describe('isProviderActive with primary=local', () => {
+  it('turns OAuth providers OFF when primary is local', () => {
+    const c = mkAuthConfig({
+      primaryProvider: 'local',
+      providers: {
+        google: { clientId: 'g', clientSecret: 's', callbackUrl: 'http://x/cb' },
+      },
+    });
+    expect(isProviderActive(c, 'google')).toBe(false);
+  });
+});
+
+describe('local auth routes', () => {
+  let tempDir = '';
+  let repo: Repository;
+  let app: Express;
+
+  beforeEach(() => {
+    tempDir = mkdtempSync(join(tmpdir(), 'maestro-localroutes-'));
+    repo = new Repository(join(tempDir, 'orchestrator.db'));
+    runMigrations(repo.getDb());
+    app = mkApp(repo, mkAuthConfig());
+  });
+  afterEach(() => {
+    repo.close();
+    if (tempDir) { rmSync(tempDir, { recursive: true, force: true }); tempDir = ''; }
+  });
+
+  it('GET /auth/login renders the local form when enabled', async () => {
+    const res = await request(app).get('/auth/login');
+    expect(res.status).toBe(200);
+    expect(res.text).toContain('action="/auth/local"');
+    expect(res.text).toContain('action="/auth/local/signup"'); // signup on
+  });
+
+  it('POST /auth/local with valid active creds redirects home', async () => {
+    repo.createLocalUser({ email: 'a@x.com', password: 'pw12345678', role: 'user', status: 'active' });
+    const res = await request(app).post('/auth/local').type('form').send({ email: 'a@x.com', password: 'pw12345678' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toBe('/');
+  });
+
+  it('POST /auth/local with wrong password redirects to login error', async () => {
+    repo.createLocalUser({ email: 'b@x.com', password: 'rightpassword', role: 'user', status: 'active' });
+    const res = await request(app).post('/auth/local').type('form').send({ email: 'b@x.com', password: 'nope' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toContain('/auth/login?error=');
+  });
+
+  it('POST /auth/local for a pending user redirects to the pending page', async () => {
+    repo.createLocalUser({ email: 'c@x.com', password: 'pw12345678', role: 'user', status: 'pending' });
+    const res = await request(app).post('/auth/local').type('form').send({ email: 'c@x.com', password: 'pw12345678' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toBe('/auth/pending');
+  });
+
+  it('POST /auth/local/signup creates a pending user', async () => {
+    const res = await request(app).post('/auth/local/signup').type('form').send({ email: 'new@x.com', password: 'pw12345678' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toBe('/auth/pending');
+    const u = repo.getUserByEmail('new@x.com');
+    expect(u?.status).toBe('pending');
+    expect(repo.verifyLocalPassword(u!.id, 'pw12345678')).toBe(true);
+  });
+
+  it('POST /auth/local/signup rejects a short password', async () => {
+    const res = await request(app).post('/auth/local/signup').type('form').send({ email: 'short@x.com', password: 'abc' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toContain('error=weak');
+    expect(repo.getUserByEmail('short@x.com')).toBeNull();
+  });
+
+  it('POST /auth/local/signup does not disclose an existing email (generic error, no overwrite)', async () => {
+    repo.createLocalUser({ email: 'dup@x.com', password: 'originalpw', role: 'user', status: 'active' });
+    const res = await request(app).post('/auth/local/signup').type('form').send({ email: 'dup@x.com', password: 'attackerpw' });
+    expect(res.status).toBe(302);
+    expect(res.headers['location']).toContain('error=signup');
+    // original password unchanged (no takeover)
+    const u = repo.getUserByEmail('dup@x.com')!;
+    expect(repo.verifyLocalPassword(u.id, 'originalpw')).toBe(true);
+    expect(repo.verifyLocalPassword(u.id, 'attackerpw')).toBe(false);
+  });
+
+  it('signup route is absent when allowSignup is off', async () => {
+    const app2 = mkApp(repo, mkAuthConfig({ local: { enabled: true, allowSignup: false } }));
+    const res = await request(app2).post('/auth/local/signup').type('form').send({ email: 'x@x.com', password: 'pw12345678' });
+    expect(res.status).toBe(404);
+  });
+});
diff --git a/src/bridge/auth.ts b/src/bridge/auth.ts
index 2688952..b3fc932 100644
--- a/src/bridge/auth.ts
+++ b/src/bridge/auth.ts
@@ -10,7 +10,7 @@ import { Strategy as GoogleStrategy } from 'passport-google-oauth20';
 import { Strategy as OAuth2Strategy } from 'passport-oauth2';
 import type { Database } from 'better-sqlite3';
 import type { AuthConfig, AuthProviderConfig } from '../config.js';
-import type { Repository } from '../db/repository.js';
+import type { Repository, User } from '../db/repository.js';
 import { logger } from '../logger.js';
 import { randomBytes } from 'crypto';
 
@@ -71,9 +71,48 @@ export function isProviderActive(authConfig: AuthConfig, kind: 'google' | 'gitea
   const primary = authConfig.primaryProvider;
   if (primary === 'google' && isProviderConfigured(authConfig.providers.google, 'google')) return kind === 'google';
   if (primary === 'gitea' && isProviderConfigured(authConfig.providers.gitea, 'gitea')) return kind === 'gitea';
+  // primary=local restricts login to local accounts → OAuth providers off.
+  if (primary === 'local' && isLocalEnabled(authConfig)) return false;
   return true;
 }
 
+/** Local email+password login is turned on. */
+export function isLocalEnabled(authConfig: AuthConfig): boolean {
+  return authConfig.local?.enabled === true;
+}
+
+/**
+ * Self-service password change for the authenticated local user. Mount behind
+ * requireAuth + a JSON body parser. Requires the CURRENT password (so a
+ * hijacked session can't silently re-key the account) and only applies to
+ * accounts that already have a local credential — OAuth-only users have none
+ * (adding one is a separate, deferred action). 204 on success.
+ */
+export function buildChangePasswordHandler(repo: Repository): RequestHandler {
+  return function changePassword(req: Request, res: Response): void {
+    const user = req.user as Express.User | undefined;
+    if (!user) { res.status(401).json({ error: 'unauthenticated' }); return; }
+    const { currentPassword, newPassword } = (req.body ?? {}) as {
+      currentPassword?: unknown;
+      newPassword?: unknown;
+    };
+    if (typeof newPassword !== 'string' || newPassword.length < 8) {
+      res.status(400).json({ error: 'new password must be at least 8 characters' });
+      return;
+    }
+    if (!repo.hasLocalCredential(user.id)) {
+      res.status(400).json({ error: 'this account has no local password to change' });
+      return;
+    }
+    if (typeof currentPassword !== 'string' || !repo.verifyLocalPassword(user.id, currentPassword)) {
+      res.status(403).json({ error: 'current password is incorrect' });
+      return;
+    }
+    repo.setLocalPassword(user.id, newPassword);
+    res.status(204).end();
+  };
+}
+
 /**
  * auth-login.html をレンダリングする。
  * primary_provider 設定と各プロバイダの configured 状態に応じて
@@ -84,27 +123,32 @@ function renderLoginPage(authConfig: AuthConfig, branding: LoginBranding = DEFAU
   const raw = readFileSync(path.join(__authDirname, 'auth-login.html'), 'utf-8');
   const googleConfigured = isProviderConfigured(authConfig.providers.google, 'google');
   const giteaConfigured = isProviderConfigured(authConfig.providers.gitea, 'gitea');
-  // Ignore a primaryProvider that points to an unconfigured provider — otherwise
-  // it would hide the only working login button and lock the operator out.
+  const localEnabled = isLocalEnabled(authConfig);
+  const allowSignup = authConfig.local?.allowSignup === true;
+  // Ignore a primaryProvider that points to an unconfigured/disabled provider —
+  // otherwise it would hide the only working login and lock the operator out.
   const primary =
     (authConfig.primaryProvider === 'google' && googleConfigured) ||
-    (authConfig.primaryProvider === 'gitea' && giteaConfigured)
+    (authConfig.primaryProvider === 'gitea' && giteaConfigured) ||
+    (authConfig.primaryProvider === 'local' && localEnabled)
       ? authConfig.primaryProvider
       : undefined;
 
-  // Decide which buttons to show
+  // Decide which login options to show
   let showGoogle: boolean;
   let showGitea: boolean;
+  let showLocal: boolean;
   if (primary === 'google') {
-    showGoogle = googleConfigured;
-    showGitea = false;
+    showGoogle = googleConfigured; showGitea = false; showLocal = false;
   } else if (primary === 'gitea') {
-    showGoogle = false;
-    showGitea = giteaConfigured;
+    showGoogle = false; showGitea = giteaConfigured; showLocal = false;
+  } else if (primary === 'local') {
+    showGoogle = false; showGitea = false; showLocal = localEnabled;
   } else {
-    // No primary specified: show every configured provider
+    // No primary specified: show every configured/enabled option
     showGoogle = googleConfigured;
     showGitea = giteaConfigured;
+    showLocal = localEnabled;
   }
 
   const stripBlock = (html: string, startMarker: string, endMarker: string): string => {
@@ -115,8 +159,15 @@ function renderLoginPage(authConfig: AuthConfig, branding: LoginBranding = DEFAU
   let out = raw;
   if (!showGoogle) out = stripBlock(out, 'GOOGLE_BUTTON_START', 'GOOGLE_BUTTON_END');
   if (!showGitea)  out = stripBlock(out, 'GITEA_BUTTON_START',  'GITEA_BUTTON_END');
-  // Hide divider unless both buttons are visible
+  // OAuth-only divider: only when BOTH oauth buttons are visible
   if (!(showGoogle && showGitea)) out = stripBlock(out, 'DIVIDER_START', 'DIVIDER_END');
+  // Local form + signup + its divider
+  if (!showLocal) out = stripBlock(out, 'LOCAL_FORM_START', 'LOCAL_FORM_END');
+  else {
+    if (!allowSignup) out = stripBlock(out, 'LOCAL_SIGNUP_START', 'LOCAL_SIGNUP_END');
+    // Divider above the local form only when an OAuth button sits above it
+    if (!(showGoogle || showGitea)) out = stripBlock(out, 'LOCAL_DIVIDER_START', 'LOCAL_DIVIDER_END');
+  }
 
   // Branding placeholders
   out = out
@@ -465,6 +516,7 @@ function registerGiteaStrategy(repo: Repository, authConfig: AuthConfig): void {
 // ── Auth Router ───────────────────────────────────────────────────────────────
 
 function createAuthRouter(
+  repo: Repository,
   authConfig: AuthConfig,
   getBranding?: () => LoginBranding,
 ): Router {
@@ -531,6 +583,65 @@ function createAuthRouter(
     );
   }
 
+  // Local accounts (email + password)
+  if (isLocalEnabled(authConfig)) {
+    const parseBody = [express.urlencoded({ extended: false }), express.json()];
+
+    const toExpressUser = (u: User): Express.User => ({
+      ...u,
+      orgIds: [],
+      defaultVisibility: u.defaultVisibility ?? 'private',
+      defaultVisibilityOrgId: u.defaultVisibilityOrgId ?? null,
+    });
+
+    const readCreds = (req: Request): { email: string; password: string } | null => {
+      const b = (req.body ?? {}) as { email?: unknown; password?: unknown };
+      if (typeof b.email !== 'string' || typeof b.password !== 'string') return null;
+      const email = b.email.trim();
+      if (!email || !b.password) return null;
+      return { email, password: b.password };
+    };
+
+    // Login: verify password, then establish the passport session via req.login.
+    router.post('/local', ...parseBody, (req: Request, res: Response, next: NextFunction) => {
+      const creds = readCreds(req);
+      if (!creds) { res.redirect('/auth/login?error=invalid'); return; }
+      const user = repo.getUserByEmail(creds.email);
+      // Verify even when the user is missing is not needed; getUserByEmail is the
+      // gate. Wrong password and unknown email both surface as the same error.
+      if (!user || !repo.verifyLocalPassword(user.id, creds.password)) {
+        res.redirect('/auth/login?error=credentials');
+        return;
+      }
+      if (user.status === 'disabled') { res.redirect('/auth/login?error=disabled'); return; }
+      req.login(toExpressUser(user), (err) => {
+        if (err) { next(err); return; }
+        res.redirect(user.status === 'active' ? '/' : '/auth/pending');
+      });
+    });
+
+    // Self-signup (opt-in): creates a pending user an admin must approve.
+    if (authConfig.local?.allowSignup) {
+      router.post('/local/signup', ...parseBody, (req: Request, res: Response, next: NextFunction) => {
+        const creds = readCreds(req);
+        if (!creds) { res.redirect('/auth/login?error=invalid'); return; }
+        if (creds.password.length < 8) { res.redirect('/auth/login?error=weak'); return; }
+        let user;
+        try {
+          user = repo.createLocalUser({ email: creds.email, password: creds.password, role: 'user', status: 'pending' });
+        } catch {
+          // Most likely the email is already registered. Don't disclose which.
+          res.redirect('/auth/login?error=signup');
+          return;
+        }
+        req.login(toExpressUser(user), (err) => {
+          if (err) { next(err); return; }
+          res.redirect('/auth/pending');
+        });
+      });
+    }
+  }
+
   // ログアウト
   router.get('/logout', (req, res, next) => {
     req.logout((err) => {
@@ -624,7 +735,7 @@ export function setupAuth(
   registerGiteaStrategy(repo, authConfig);
 
   // 認証ルーター
-  const authRouter = createAuthRouter(authConfig, getBranding);
+  const authRouter = createAuthRouter(repo, authConfig, getBranding);
 
   const passportInit = passport.initialize();
   const passportSession = passport.session();
diff --git a/src/bridge/server.ts b/src/bridge/server.ts
index 72d344c..a0258ba 100644
--- a/src/bridge/server.ts
+++ b/src/bridge/server.ts
@@ -22,7 +22,7 @@ import { setSessionManager } from '../engine/tools/browser.js';
 import { setUserFolderToolDeps } from '../engine/tools/user-folder.js';
 import { setSkillToolDeps } from '../engine/tools/skills.js';
 import { setAppDocsDeps } from '../engine/tools/app-docs.js';
-import { setupAuth, requireAuth, requireAdmin, isProviderConfigured } from './auth.js';
+import { setupAuth, requireAuth, requireAdmin, isProviderConfigured, isLocalEnabled, buildChangePasswordHandler } from './auth.js';
 import { canUserSeeTask } from './visibility.js';
 import { mountAdminApi } from './admin-api.js';
 import { createAdminGatewayApi } from './admin-gateway-api.js';
@@ -238,14 +238,20 @@ export function createCoreServer(opts: CoreServerOptions): {
   const _hasAnyField = (p?: { clientId?: string; clientSecret?: string; callbackUrl?: string; baseUrl?: string }) =>
     !!(p?.clientId || p?.clientSecret || p?.callbackUrl || p?.baseUrl);
   const authIntended = _hasAnyField(_authProviders?.google) || _hasAnyField(_authProviders?.gitea);
-  if (authIntended && !authUsable) {
+  // Local email+password is a first-class auth mode: when enabled, auth is
+  // active even without any OAuth provider.
+  const localEnabled = !!opts.authConfig && isLocalEnabled(opts.authConfig);
+  // Fail closed on a partial OAuth config ONLY when it would otherwise drop to
+  // no-auth. If local auth is on, auth is already active (no fail-open), so a
+  // half-configured OAuth provider just stays inactive rather than aborting boot.
+  if (authIntended && !authUsable && !localEnabled) {
     throw new Error(
       '[auth] auth is partially configured: a provider has a client_id but is missing ' +
         'client_secret / callback_url (Gitea also needs base_url). Refusing to start in an ' +
         'insecure no-auth state — complete the provider config or remove it from config.yaml.',
     );
   }
-  const authActive = authUsable;
+  const authActive = authUsable || localEnabled;
   if (!authActive) {
     // No-auth single-user mode: per-user rows are owned by the synthetic
     // 'local' id, and several tables FK to users(id) (ssh_user_deks,
@@ -256,6 +262,15 @@ export function createCoreServer(opts: CoreServerOptions): {
   let authenticateUpgrade: import('./auth.js').UpgradeAuthChecker | undefined;
 
   if (authActive) {
+    // Idempotently seed the shared `local` system admin (id='local', the same
+    // owner the no-auth path uses) so an existing single-user / no-auth
+    // deployment gains a login mid-stream and keeps its `local`-owned data.
+    const bootstrap = opts.authConfig?.local?.bootstrapAdmin;
+    if (localEnabled && bootstrap?.email && bootstrap?.password) {
+      repo.upsertLocalSystemAdmin({ email: bootstrap.email, password: bootstrap.password });
+      logger.info(`[auth] seeded local system admin id=local email=${bootstrap.email}`);
+    }
+
     const auth = setupAuth(
       repo,
       opts.authConfig!,
@@ -280,6 +295,9 @@ export function createCoreServer(opts: CoreServerOptions): {
       res.json(req.user);
     });
 
+    // Self-service password change for local accounts (see auth.ts).
+    app.post('/api/auth/password', requireAuth, express.json(), buildChangePasswordHandler(repo));
+
     // Protect all API routes (except /api/version and /health)
     app.use('/api/local', requireAuth);
     app.use('/api/repos', requireAuth);
@@ -304,7 +322,7 @@ export function createCoreServer(opts: CoreServerOptions): {
 
   // Admin user management API (always mounted; protected by requireAdmin when auth is active)
   app.use('/api/admin', express.json());
-  mountAdminApi(app, repo, authActive);
+  mountAdminApi(app, repo, authActive, loadConfig()?.userFolderRoot ?? './data/users');
 
   // AAO Gateway Phase 2a: admin-only CRUD over gateway_virtual_keys.
   // Enabled regardless of gateway.enabled so an admin can prep keys
diff --git a/src/config.ts b/src/config.ts
index 88f62f8..e2d8689 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -309,7 +309,24 @@ export interface AuthProviderConfig {
   baseUrl?: string; // Gitea 用
 }
 
-export type PrimaryAuthProvider = 'google' | 'gitea';
+export type PrimaryAuthProvider = 'google' | 'gitea' | 'local';
+
+/**
+ * Local-account auth (email + password). A third option between OAuth-only and
+ * open no-auth. See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+export interface LocalAuthConfig {
+  /** Turn local login on. When true, authActive becomes true even without OAuth. */
+  enabled?: boolean;
+  /** Allow self-signup (creates a pending user an admin must approve). */
+  allowSignup?: boolean;
+  /**
+   * Seed (idempotently, at startup) the shared `local` system admin under the
+   * same owner id the no-auth path uses, so existing single-user-mode data is
+   * carried over. Re-running updates the password.
+   */
+  bootstrapAdmin?: { email: string; password: string };
+}
 
 export interface AuthConfig {
   sessionSecret: string;
@@ -321,6 +338,8 @@ export interface AuthConfig {
     google?: AuthProviderConfig;
     gitea?: AuthProviderConfig;
   };
+  /** Local email+password accounts. Undefined = disabled. */
+  local?: LocalAuthConfig;
 }
 
 export interface BrandingConfig {
diff --git a/src/db/migrate.ts b/src/db/migrate.ts
index 64d1060..209375b 100644
--- a/src/db/migrate.ts
+++ b/src/db/migrate.ts
@@ -546,5 +546,14 @@ function migratePushNotificationsTables(db: Database.Database): void {
       v1_migrated          INTEGER NOT NULL DEFAULT 0,
       updated_at           TEXT NOT NULL DEFAULT (datetime('now'))
     );
+
+    -- Local-auth credentials (email + password accounts). Idempotent add so
+    -- an existing no-auth / OAuth-only deployment gains local login on upgrade.
+    CREATE TABLE IF NOT EXISTS local_credentials (
+      user_id       TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+      password_hash TEXT NOT NULL,
+      salt          TEXT NOT NULL,
+      updated_at    TEXT NOT NULL DEFAULT (datetime('now'))
+    );
   `);
 }
diff --git a/src/db/repository-local-auth.test.ts b/src/db/repository-local-auth.test.ts
new file mode 100644
index 0000000..063697e
--- /dev/null
+++ b/src/db/repository-local-auth.test.ts
@@ -0,0 +1,126 @@
+/**
+ * Local-auth repository layer: password hashing, local account creation,
+ * the shared `local` system admin, and the user-deletion guards.
+ *
+ * See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+import { afterEach, describe, it, expect, beforeEach } from 'vitest';
+import { mkdtempSync, rmSync } from 'fs';
+import { join } from 'path';
+import { tmpdir } from 'os';
+import { Repository } from './repository.js';
+import { runMigrations } from './migrate.js';
+
+describe('Repository local-auth', () => {
+  let tempDir = '';
+  let repo: Repository;
+
+  beforeEach(() => {
+    tempDir = mkdtempSync(join(tmpdir(), 'maestro-localauth-'));
+    repo = new Repository(join(tempDir, 'orchestrator.db'));
+    runMigrations(repo.getDb());
+  });
+
+  afterEach(() => {
+    repo.close();
+    if (tempDir) {
+      rmSync(tempDir, { recursive: true, force: true });
+      tempDir = '';
+    }
+  });
+
+  // ── password hashing ──────────────────────────────────────────
+
+  it('setLocalPassword + verifyLocalPassword round-trips', () => {
+    const u = repo.createUser({ email: 'a@x.com', name: 'A', role: 'user', status: 'active' });
+    repo.setLocalPassword(u.id, 'correct horse battery staple');
+    expect(repo.verifyLocalPassword(u.id, 'correct horse battery staple')).toBe(true);
+    expect(repo.verifyLocalPassword(u.id, 'wrong')).toBe(false);
+  });
+
+  it('verifyLocalPassword returns false for a user with no credential', () => {
+    const u = repo.createUser({ email: 'b@x.com', name: 'B', role: 'user', status: 'active' });
+    expect(repo.verifyLocalPassword(u.id, 'anything')).toBe(false);
+  });
+
+  it('setLocalPassword is idempotent-overwrite (re-set changes the password)', () => {
+    const u = repo.createUser({ email: 'c@x.com', name: 'C', role: 'user', status: 'active' });
+    repo.setLocalPassword(u.id, 'first');
+    repo.setLocalPassword(u.id, 'second');
+    expect(repo.verifyLocalPassword(u.id, 'first')).toBe(false);
+    expect(repo.verifyLocalPassword(u.id, 'second')).toBe(true);
+  });
+
+  it('stores a per-user random salt (two users, same password → different hash)', () => {
+    const u1 = repo.createUser({ email: 'd@x.com', name: 'D', role: 'user', status: 'active' });
+    const u2 = repo.createUser({ email: 'e@x.com', name: 'E', role: 'user', status: 'active' });
+    repo.setLocalPassword(u1.id, 'same');
+    repo.setLocalPassword(u2.id, 'same');
+    const db = repo.getDb();
+    const r1 = db.prepare('SELECT password_hash, salt FROM local_credentials WHERE user_id=?').get(u1.id) as { password_hash: string; salt: string };
+    const r2 = db.prepare('SELECT password_hash, salt FROM local_credentials WHERE user_id=?').get(u2.id) as { password_hash: string; salt: string };
+    expect(r1.salt).not.toBe(r2.salt);
+    expect(r1.password_hash).not.toBe(r2.password_hash);
+  });
+
+  // ── createLocalUser ───────────────────────────────────────────
+
+  it('createLocalUser creates a pending user with a local identity + password', () => {
+    const u = repo.createLocalUser({ email: 'new@x.com', password: 'pw12345', role: 'user', status: 'pending' });
+    expect(u.email).toBe('new@x.com');
+    expect(u.status).toBe('pending');
+    expect(repo.verifyLocalPassword(u.id, 'pw12345')).toBe(true);
+    const idn = repo.getDb().prepare("SELECT provider, provider_id FROM oauth_accounts WHERE user_id=? AND provider='local'").get(u.id) as { provider: string; provider_id: string };
+    expect(idn.provider).toBe('local');
+    expect(idn.provider_id).toBe('new@x.com');
+  });
+
+  it('createLocalUser REJECTS an email that already exists (no account takeover)', () => {
+    repo.createUser({ email: 'taken@x.com', name: 'T', role: 'user', status: 'active' });
+    expect(() => repo.createLocalUser({ email: 'taken@x.com', password: 'pw', role: 'user', status: 'pending' }))
+      .toThrow(/exist/i);
+  });
+
+  // ── upsertLocalSystemAdmin (shared 'local' identity) ──────────
+
+  it('upsertLocalSystemAdmin creates the shared id=local admin (active)', () => {
+    const u = repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'adminpw' });
+    expect(u.id).toBe('local');
+    expect(u.role).toBe('admin');
+    expect(u.status).toBe('active');
+    expect(repo.verifyLocalPassword('local', 'adminpw')).toBe(true);
+  });
+
+  it('upsertLocalSystemAdmin is idempotent and keeps id=local across re-seeds', () => {
+    repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'pw1' });
+    const again = repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'pw2' });
+    expect(again.id).toBe('local');
+    // password updated on re-seed
+    expect(repo.verifyLocalPassword('local', 'pw2')).toBe(true);
+    // exactly one users row with id=local
+    const cnt = repo.getDb().prepare("SELECT COUNT(*) c FROM users WHERE id='local'").get() as { c: number };
+    expect(cnt.c).toBe(1);
+  });
+
+  it('local-owned data survives because the admin IS the local owner (id=local)', () => {
+    // Simulate no-auth data owned by 'local', then seed the admin onto it.
+    repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'pw' });
+    expect(repo.getUserById('local')?.role).toBe('admin');
+  });
+
+  // ── deleteUser guards ─────────────────────────────────────────
+
+  it('deleteUser REFUSES to delete the local/system user', () => {
+    repo.upsertLocalSystemAdmin({ email: 'admin@x.com', password: 'pw' });
+    expect(() => repo.deleteUser('local')).toThrow(/local|system/i);
+    expect(repo.getUserById('local')).not.toBeNull();
+  });
+
+  it('deleteUser cascades local_credentials (FK ON DELETE CASCADE)', () => {
+    const u = repo.createLocalUser({ email: 'z@x.com', password: 'pw', role: 'user', status: 'active' });
+    expect(repo.verifyLocalPassword(u.id, 'pw')).toBe(true);
+    repo.deleteUser(u.id);
+    const row = repo.getDb().prepare('SELECT 1 FROM local_credentials WHERE user_id=?').get(u.id);
+    expect(row).toBeUndefined();
+  });
+});
diff --git a/src/db/repository.ts b/src/db/repository.ts
index f5740d5..ef2264d 100644
--- a/src/db/repository.ts
+++ b/src/db/repository.ts
@@ -2,7 +2,7 @@ import Database from 'better-sqlite3';
 import { readFileSync, rmSync, existsSync } from 'fs';
 import { fileURLToPath } from 'url';
 import { dirname, join } from 'path';
-import { randomUUID } from 'crypto';
+import { randomUUID, scryptSync, randomBytes, timingSafeEqual } from 'crypto';
 import { v4 as uuidv4 } from 'uuid';
 import { logger } from '../logger.js';
 import { buildVisibilityWhere } from '../bridge/visibility.js';
@@ -572,6 +572,14 @@ export interface FindOrCreateByOAuthParams {
   avatarUrl?: string;
 }
 
+export interface CreateLocalUserParams {
+  email: string;
+  password: string;
+  role: 'admin' | 'user';
+  status: 'active' | 'pending' | 'disabled';
+  name?: string;
+}
+
 export interface GiteaOrgInput {
   orgId: string;
   orgName: string;
@@ -2477,6 +2485,99 @@ export class Repository {
       .run({ now });
   }
 
+  // ── Local auth (email + password) ─────────────────────────────────────
+
+  /** scrypt hash with a fresh per-user salt. Overwrites any existing credential. */
+  setLocalPassword(userId: string, plainPassword: string): void {
+    const salt = randomBytes(16).toString('hex');
+    const hash = scryptSync(plainPassword, salt, 64).toString('hex');
+    const now = new Date().toISOString();
+    this.db
+      .prepare(
+        `INSERT INTO local_credentials (user_id, password_hash, salt, updated_at)
+         VALUES (@userId, @hash, @salt, @now)
+         ON CONFLICT(user_id) DO UPDATE SET password_hash=@hash, salt=@salt, updated_at=@now`,
+      )
+      .run({ userId, hash, salt, now });
+  }
+
+  /** Constant-time verify. False when the user has no local credential. */
+  verifyLocalPassword(userId: string, plainPassword: string): boolean {
+    const row = this.db
+      .prepare('SELECT password_hash, salt FROM local_credentials WHERE user_id = ?')
+      .get(userId) as { password_hash: string; salt: string } | undefined;
+    if (!row) return false;
+    const expected = Buffer.from(row.password_hash, 'hex');
+    const actual = scryptSync(plainPassword, row.salt, expected.length);
+    return expected.length === actual.length && timingSafeEqual(expected, actual);
+  }
+
+  hasLocalCredential(userId: string): boolean {
+    return !!this.db.prepare('SELECT 1 FROM local_credentials WHERE user_id = ?').get(userId);
+  }
+
+  /**
+   * Create a brand-new local account (self-signup or admin-created). The email
+   * MUST be unused: attaching a password to an existing account would be an
+   * account-takeover vector, so we reject instead of linking. Linking a local
+   * credential to an existing OAuth account is a separate, authenticated action
+   * (not v1 signup).
+   */
+  createLocalUser(params: CreateLocalUserParams): User {
+    if (this.getUserByEmail(params.email)) {
+      throw new Error(`createLocalUser: a user with email ${params.email} already exists`);
+    }
+    const user = this.createUser({
+      email: params.email,
+      name: params.name ?? params.email,
+      role: params.role,
+      status: params.status,
+    });
+    this.db
+      .prepare(
+        `INSERT OR IGNORE INTO oauth_accounts (id, user_id, provider, provider_id, created_at)
+         VALUES (@id, @userId, 'local', @providerId, @now)`,
+      )
+      .run({ id: uuidv4(), userId: user.id, providerId: params.email, now: new Date().toISOString() });
+    this.setLocalPassword(user.id, params.password);
+    return user;
+  }
+
+  /**
+   * Idempotently seed the shared system admin under the fixed id `local` — the
+   * same owner the no-auth path synthesizes. This makes all pre-existing
+   * `local`-owned data belong to the logged-in admin once local auth is turned
+   * on, and lets an existing no-auth deployment gain a login mid-stream.
+   * Re-running updates the password and keeps role=admin/status=active.
+   */
+  upsertLocalSystemAdmin(params: { email: string; password: string; name?: string }): User {
+    const LOCAL_ID = 'local';
+    const now = new Date().toISOString();
+    const existing = this.getUserById(LOCAL_ID);
+    if (!existing) {
+      this.db
+        .prepare(
+          `INSERT INTO users (id, email, name, avatar_url, role, status, created_at, updated_at)
+           VALUES (@id, @email, @name, NULL, 'admin', 'active', @now, @now)`,
+        )
+        .run({ id: LOCAL_ID, email: params.email, name: params.name ?? 'Local Admin', now });
+    } else {
+      this.db
+        .prepare(`UPDATE users SET email=@email, role='admin', status='active', updated_at=@now WHERE id=@id`)
+        .run({ id: LOCAL_ID, email: params.email, now });
+    }
+    this.db
+      .prepare(
+        `INSERT OR IGNORE INTO oauth_accounts (id, user_id, provider, provider_id, created_at)
+         VALUES (@id, @userId, 'local', @providerId, @now)`,
+      )
+      .run({ id: uuidv4(), userId: LOCAL_ID, providerId: params.email, now });
+    this.setLocalPassword(LOCAL_ID, params.password);
+    const user = this.getUserById(LOCAL_ID);
+    if (!user) throw new Error('upsertLocalSystemAdmin: failed to retrieve local admin');
+    return user;
+  }
+
   getUserById(id: string): User | null {
     const row = this.db
       .prepare('SELECT * FROM users WHERE id = ?')
@@ -2609,6 +2710,12 @@ export class Repository {
   }
 
   deleteUser(id: string): void {
+    // Never delete the shared `local` system/admin user: it is the no-auth
+    // fallback owner and owns all single-user-mode data. Deleting it would
+    // break no-auth mode and orphan every `local`-owned task/job/folder.
+    if (id === 'local') {
+      throw new Error('cannot delete the local/system user');
+    }
     this.db.prepare('DELETE FROM users WHERE id = ?').run(id);
   }
 
diff --git a/src/db/schema.sql b/src/db/schema.sql
index 9d4e4de..7de7df7 100644
--- a/src/db/schema.sql
+++ b/src/db/schema.sql
@@ -163,6 +163,16 @@ CREATE TABLE IF NOT EXISTS oauth_accounts (
   UNIQUE(provider, provider_id)
 );
 
+-- Auth: local-account credentials (email + password). One row per user that
+-- has a local password; OAuth-only users have none. scrypt hash + per-user
+-- salt. Cascades with the user so deletion leaves no orphaned credential.
+CREATE TABLE IF NOT EXISTS local_credentials (
+  user_id       TEXT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+  password_hash TEXT NOT NULL,
+  salt          TEXT NOT NULL,
+  updated_at    TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
 -- Auth: sessions (express-session)
 CREATE TABLE IF NOT EXISTS sessions (
   sid     TEXT PRIMARY KEY,
diff --git a/src/user-folder/delete-folder.test.ts b/src/user-folder/delete-folder.test.ts
new file mode 100644
index 0000000..65ec33a
--- /dev/null
+++ b/src/user-folder/delete-folder.test.ts
@@ -0,0 +1,45 @@
+/**
+ * deleteUserFolder — removes a user's filesystem folder on account deletion.
+ *
+ * The DB cascade-deletes owned rows, but the user folder
+ * ({root}/{ownerId}/...) is on disk and was previously orphaned on delete.
+ * See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, rmSync, mkdirSync, writeFileSync, existsSync } from 'fs';
+import { join } from 'path';
+import { tmpdir } from 'os';
+import { deleteUserFolder, ensureUserFolder } from './paths.js';
+
+describe('deleteUserFolder', () => {
+  let root = '';
+  beforeEach(() => { root = mkdtempSync(join(tmpdir(), 'maestro-uf-')); });
+  afterEach(() => { if (root) { rmSync(root, { recursive: true, force: true }); root = ''; } });
+
+  it('removes the entire user folder', () => {
+    const dir = ensureUserFolder(root, 'alice');
+    writeFileSync(join(dir, 'notes', 'x.md'), 'hi');
+    expect(existsSync(dir)).toBe(true);
+    deleteUserFolder(root, 'alice');
+    expect(existsSync(dir)).toBe(false);
+  });
+
+  it('NEVER removes the local/system folder (shared no-auth owner)', () => {
+    const dir = ensureUserFolder(root, 'local');
+    deleteUserFolder(root, 'local');
+    expect(existsSync(dir)).toBe(true); // preserved
+  });
+
+  it('is a no-op when the folder does not exist', () => {
+    expect(() => deleteUserFolder(root, 'ghost')).not.toThrow();
+  });
+
+  it('refuses path-traversal ids (no escape outside root)', () => {
+    // userRoot rejects these; deleteUserFolder must not delete anything outside.
+    const sibling = mkdtempSync(join(tmpdir(), 'maestro-sibling-'));
+    writeFileSync(join(sibling, 'keep.txt'), 'keep');
+    expect(() => deleteUserFolder(root, '../../etc')).not.toThrow();
+    expect(existsSync(join(sibling, 'keep.txt'))).toBe(true);
+    rmSync(sibling, { recursive: true, force: true });
+  });
+});
diff --git a/src/user-folder/paths.ts b/src/user-folder/paths.ts
index 5a863aa..a88b9f6 100644
--- a/src/user-folder/paths.ts
+++ b/src/user-folder/paths.ts
@@ -1,6 +1,9 @@
-import { mkdirSync, chmodSync, existsSync, readFileSync, writeFileSync, unlinkSync, statSync, openSync, readSync, closeSync } from 'fs';
+import { mkdirSync, chmodSync, existsSync, readFileSync, writeFileSync, unlinkSync, statSync, openSync, readSync, closeSync, rmSync } from 'fs';
 import { resolve, join, relative, isAbsolute } from 'path';
 
+/** The shared no-auth / local-auth system owner. Its folder is never deleted. */
+export const LOCAL_SYSTEM_OWNER_ID = 'local';
+
 const USER_AGENTS_MAX_BYTES = 64 * 1024;
 
 export const USER_SUBDIRS = ['scripts', 'browser-macros', 'templates', 'recordings', 'trash', 'memory', 'pets', 'notes'] as const;
@@ -29,6 +32,29 @@ export function ensureUserFolder(rootDir: string, ownerId: string): string {
   return root;
 }
 
+/**
+ * Recursively remove a user's entire folder ({root}/{ownerId}). Called when an
+ * account is deleted so its scripts/macros/recordings/notes/memory/pets don't
+ * orphan on disk (the DB cascade-deletes rows but not files).
+ *
+ * Guards:
+ *  - the `local` system owner is NEVER removed (shared no-auth / local-auth
+ *    admin; deleting it would wipe the single-user deployment's data)
+ *  - an invalid / traversal ownerId resolves to nothing and is a silent no-op
+ *    (userRoot throws on '/', '\\', '\0', absolute paths)
+ *  - missing folder is a no-op (rmSync force)
+ */
+export function deleteUserFolder(rootDir: string, ownerId: string): void {
+  if (ownerId === LOCAL_SYSTEM_OWNER_ID) return;
+  let root: string;
+  try {
+    root = userRoot(rootDir, ownerId);
+  } catch {
+    return; // invalid ownerId — never delete anything outside a valid user root
+  }
+  rmSync(root, { recursive: true, force: true });
+}
+
 export function resolveUserSubdir(
   rootDir: string,
   ownerId: string,
diff --git a/ui/src/components/admin/LocalUserDialogs.tsx b/ui/src/components/admin/LocalUserDialogs.tsx
new file mode 100644
index 0000000..d57e205
--- /dev/null
+++ b/ui/src/components/admin/LocalUserDialogs.tsx
@@ -0,0 +1,186 @@
+import { useState, type FormEvent } from 'react';
+
+/**
+ * Local-account dialogs:
+ *  - CreateLocalUserDialog  — admin creates an email+password account (active)
+ *  - ResetPasswordDialog    — admin resets another user's local password
+ *  - ChangePasswordDialog   — the signed-in user changes their own password
+ *
+ * Self-contained (own fetch + state); callers pass close/success callbacks.
+ * See docs/superpowers/plans/2026-06-09-local-auth.md.
+ */
+
+const overlay = 'fixed inset-0 z-50 flex items-center justify-center bg-black/40 p-4';
+const panel = 'w-full max-w-sm bg-canvas border border-hairline rounded-lg shadow-xl p-5';
+const inputCls = 'w-full h-9 px-2.5 text-[13px] border border-hairline rounded-md focus:ring-2 focus:ring-accent-ring focus:border-accent outline-none bg-canvas';
+const labelCls = 'block text-2xs font-medium text-slate-500 mb-1';
+
+function Field({ label, children }: { label: string; children: React.ReactNode }) {
+  return <div className="mb-3"><span className={labelCls}>{label}</span>{children}</div>;
+}
+
+function ErrorNote({ msg }: { msg: string | null }) {
+  if (!msg) return null;
+  return <p className="text-2xs text-red-600 bg-red-50 dark:bg-red-500/15 border border-red-200 dark:border-red-500/30 rounded px-2 py-1 mb-3">{msg}</p>;
+}
+
+function Actions({ onClose, busy, submitLabel }: { onClose: () => void; busy: boolean; submitLabel: string }) {
+  return (
+    <div className="flex justify-end gap-2 mt-1">
+      <button type="button" onClick={onClose} className="px-3 h-8 rounded-md text-xs font-medium border border-hairline text-slate-700 hover:bg-surface">
+        キャンセル
+      </button>
+      <button type="submit" disabled={busy} className="px-3 h-8 rounded-md text-xs font-semibold bg-accent text-white disabled:opacity-50 hover:opacity-90">
+        {busy ? '...' : submitLabel}
+      </button>
+    </div>
+  );
+}
+
+export function CreateLocalUserDialog({ onClose, onCreated }: { onClose: () => void; onCreated: () => void }) {
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [role, setRole] = useState<'user' | 'admin'>('user');
+  const [err, setErr] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+
+  const submit = async (e: FormEvent) => {
+    e.preventDefault();
+    setErr(null);
+    if (password.length < 8) { setErr('パスワードは8文字以上にしてください'); return; }
+    setBusy(true);
+    try {
+      const res = await fetch('/api/admin/users', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ email: email.trim(), password, role }),
+      });
+      if (res.status === 409) { setErr('そのメールアドレスは既に登録されています'); return; }
+      if (!res.ok) { setErr('作成に失敗しました'); return; }
+      onCreated();
+      onClose();
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <div className={overlay} onClick={onClose}>
+      <form className={panel} onClick={e => e.stopPropagation()} onSubmit={submit}>
+        <h3 className="text-sm font-semibold text-slate-900 mb-4">ローカルユーザーを作成</h3>
+        <ErrorNote msg={err} />
+        <Field label="メールアドレス">
+          <input type="email" required value={email} onChange={e => setEmail(e.target.value)} className={inputCls} autoComplete="off" />
+        </Field>
+        <Field label="初期パスワード（8文字以上）">
+          <input type="password" required minLength={8} value={password} onChange={e => setPassword(e.target.value)} className={inputCls} autoComplete="new-password" />
+        </Field>
+        <Field label="ロール">
+          <select value={role} onChange={e => setRole(e.target.value as 'user' | 'admin')} className={inputCls}>
+            <option value="user">User</option>
+            <option value="admin">Admin</option>
+          </select>
+        </Field>
+        <p className="text-2xs text-slate-500 mb-3">作成したアカウントは即座に有効（active）になります。</p>
+        <Actions onClose={onClose} busy={busy} submitLabel="作成" />
+      </form>
+    </div>
+  );
+}
+
+export function ResetPasswordDialog({ userId, email, onClose }: { userId: string; email: string; onClose: () => void }) {
+  const [password, setPassword] = useState('');
+  const [err, setErr] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  const [done, setDone] = useState(false);
+
+  const submit = async (e: FormEvent) => {
+    e.preventDefault();
+    setErr(null);
+    if (password.length < 8) { setErr('パスワードは8文字以上にしてください'); return; }
+    setBusy(true);
+    try {
+      const res = await fetch(`/api/admin/users/${userId}/password`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ password }),
+      });
+      if (!res.ok) { setErr('リセットに失敗しました'); return; }
+      setDone(true);
+      setTimeout(onClose, 900);
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <div className={overlay} onClick={onClose}>
+      <form className={panel} onClick={e => e.stopPropagation()} onSubmit={submit}>
+        <h3 className="text-sm font-semibold text-slate-900 mb-1">パスワードをリセット</h3>
+        <p className="text-2xs text-slate-500 mb-4 truncate">{email}</p>
+        {done ? (
+          <p className="text-xs text-emerald-700 dark:text-emerald-300">リセットしました。該当ユーザーのセッションは無効化されます。</p>
+        ) : (
+          <>
+            <ErrorNote msg={err} />
+            <Field label="新しいパスワード（8文字以上）">
+              <input type="password" required minLength={8} value={password} onChange={e => setPassword(e.target.value)} className={inputCls} autoComplete="new-password" />
+            </Field>
+            <Actions onClose={onClose} busy={busy} submitLabel="リセット" />
+          </>
+        )}
+      </form>
+    </div>
+  );
+}
+
+export function ChangePasswordDialog({ onClose }: { onClose: () => void }) {
+  const [current, setCurrent] = useState('');
+  const [next, setNext] = useState('');
+  const [err, setErr] = useState<string | null>(null);
+  const [busy, setBusy] = useState(false);
+  const [done, setDone] = useState(false);
+
+  const submit = async (e: FormEvent) => {
+    e.preventDefault();
+    setErr(null);
+    if (next.length < 8) { setErr('新しいパスワードは8文字以上にしてください'); return; }
+    setBusy(true);
+    try {
+      const res = await fetch('/api/auth/password', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ currentPassword: current, newPassword: next }),
+      });
+      if (res.status === 403) { setErr('現在のパスワードが正しくありません'); return; }
+      if (res.status === 400) { setErr('このアカウントにはローカルパスワードがありません'); return; }
+      if (!res.ok) { setErr('変更に失敗しました'); return; }
+      setDone(true);
+      setTimeout(onClose, 900);
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <div className={overlay} onClick={onClose}>
+      <form className={panel} onClick={e => e.stopPropagation()} onSubmit={submit}>
+        <h3 className="text-sm font-semibold text-slate-900 mb-4">パスワードを変更</h3>
+        {done ? (
+          <p className="text-xs text-emerald-700 dark:text-emerald-300">変更しました。</p>
+        ) : (
+          <>
+            <ErrorNote msg={err} />
+            <Field label="現在のパスワード">
+              <input type="password" required value={current} onChange={e => setCurrent(e.target.value)} className={inputCls} autoComplete="current-password" />
+            </Field>
+            <Field label="新しいパスワード（8文字以上）">
+              <input type="password" required minLength={8} value={next} onChange={e => setNext(e.target.value)} className={inputCls} autoComplete="new-password" />
+            </Field>
+            <Actions onClose={onClose} busy={busy} submitLabel="変更" />
+          </>
+        )}
+      </form>
+    </div>
+  );
+}
diff --git a/ui/src/components/layout/TopBar.tsx b/ui/src/components/layout/TopBar.tsx
index a353bd2..29ed10d 100644
--- a/ui/src/components/layout/TopBar.tsx
+++ b/ui/src/components/layout/TopBar.tsx
@@ -2,6 +2,7 @@ import { useEffect, useState } from 'react';
 import type { PageId } from '../../lib/urlState';
 import type { AuthUser } from '../../App';
 import { ThemeToggle } from './ThemeToggle';
+import { ChangePasswordDialog } from '../admin/LocalUserDialogs';
 
 interface TopBarProps {
   currentPage: PageId;
@@ -74,6 +75,7 @@ export function TopBar({
 }: TopBarProps) {
   const visibleNav = visibleNavItemsFor(isAdmin, authEnabled);
   const compactMode = useViewportNarrow(estimateCollapseThreshold(visibleNav.length));
+  const [showPwChange, setShowPwChange] = useState(false);
 
   return (
     <div
@@ -170,6 +172,13 @@ export function TopBar({
                   {user.name ?? user.email}
                 </span>
               </div>
+              <button
+                type="button"
+                onClick={() => setShowPwChange(true)}
+                className="px-2 py-1 rounded-md text-2xs text-slate-500 hover:text-slate-800 hover:bg-surface transition-colors"
+              >
+                パスワード変更
+              </button>
               <a
                 href="/auth/logout"
                 className="px-2 py-1 rounded-md text-2xs text-slate-500 hover:text-slate-800 hover:bg-surface transition-colors"
@@ -178,6 +187,7 @@ export function TopBar({
               </a>
             </div>
           )}
+          {showPwChange && <ChangePasswordDialog onClose={() => setShowPwChange(false)} />}
         </div>
       </div>
     </div>
diff --git a/ui/src/pages/UsersPage.tsx b/ui/src/pages/UsersPage.tsx
index b628e38..b828f87 100644
--- a/ui/src/pages/UsersPage.tsx
+++ b/ui/src/pages/UsersPage.tsx
@@ -2,6 +2,7 @@ import { useMemo, useState } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { EmptyState } from '../components/shared/EmptyState';
 import { StatChip } from '../components/shared/StatChip';
+import { CreateLocalUserDialog, ResetPasswordDialog } from '../components/admin/LocalUserDialogs';
 
 interface UserOrg {
   orgId: string;
@@ -125,6 +126,8 @@ export function UsersPage() {
   const [filter, setFilter] = useState<UserFilter>('all');
   const [search, setSearch] = useState('');
   const [activeId, setActiveId] = useState<string | null>(null);
+  const [showCreate, setShowCreate] = useState(false);
+  const [resetUser, setResetUser] = useState<UserRecord | null>(null);
   // Mobile single-column flow: list ↔ detail toggle. On sm+ both panes
   // are visible side-by-side and this flag is ignored.
   const [mobileShowDetail, setMobileShowDetail] = useState(false);
@@ -199,6 +202,7 @@ export function UsersPage() {
           onSelect={handleSelect}
           onClearFilters={() => { setSearch(''); setFilter('all'); }}
           isLoading={isLoading}
+          onCreate={() => setShowCreate(true)}
         />
       </div>
       <div className={`${mobileShowDetail ? 'flex' : 'hidden sm:flex'} flex-1 min-w-0 bg-canvas flex-col`}>
@@ -206,6 +210,7 @@ export function UsersPage() {
           user={active}
           onMobileBack={handleMobileBack}
           onPatch={(id, body) => patchMutation.mutate({ id, body })}
+          onResetPassword={(u) => setResetUser(u)}
           onDelete={(id) => {
             if (confirm('本当にこのユーザーを削除しますか？')) {
               deleteMutation.mutate(id);
@@ -215,6 +220,20 @@ export function UsersPage() {
           }}
         />
       </div>
+
+      {showCreate && (
+        <CreateLocalUserDialog
+          onClose={() => setShowCreate(false)}
+          onCreated={() => qc.invalidateQueries({ queryKey: ['admin', 'users'] })}
+        />
+      )}
+      {resetUser && (
+        <ResetPasswordDialog
+          userId={resetUser.id}
+          email={resetUser.email}
+          onClose={() => setResetUser(null)}
+        />
+      )}
     </div>
   );
 }
@@ -230,11 +249,12 @@ interface UserListPaneProps {
   onSelect: (id: string) => void;
   onClearFilters: () => void;
   isLoading: boolean;
+  onCreate: () => void;
 }
 
 function UserListPane({
   users, activeId, counts, filter, setFilter, search, setSearch,
-  onSelect, onClearFilters, isLoading,
+  onSelect, onClearFilters, isLoading, onCreate,
 }: UserListPaneProps) {
   const hasFilters = !!search || filter !== 'all';
 
@@ -255,6 +275,13 @@ function UserListPane({
             <span><span className="font-semibold text-amber-600">{counts.pending}</span> 件 承認待ち</span>
           </>
         )}
+        <button
+          type="button"
+          onClick={onCreate}
+          className="ml-auto px-2 h-6 rounded-md text-2xs font-semibold text-accent border border-accent/60 hover:bg-accent-soft transition-colors font-sans"
+        >
+          + ローカルユーザー
+        </button>
       </div>
 
       <div className="flex flex-col gap-2 pb-3 border-b border-hairline">
@@ -312,7 +339,7 @@ function UserListPane({
             <EmptyState
               compact
               title="ユーザーがいません"
-              hint="OAuth ログインを行うとここに表示されます。"
+              hint="OAuth ログイン、または「+ ローカルユーザー」で作成するとここに表示されます。"
             />
           )
         )}
@@ -365,11 +392,12 @@ interface UserDetailPaneProps {
   user: UserRecord | null;
   onPatch: (id: string, body: Record<string, unknown>) => void;
   onDelete: (id: string) => void;
+  onResetPassword: (user: UserRecord) => void;
   /** Mobile-only callback to return to the list pane. Hidden on sm+. */
   onMobileBack?: () => void;
 }
 
-function UserDetailPane({ user, onPatch, onDelete, onMobileBack }: UserDetailPaneProps) {
+function UserDetailPane({ user, onPatch, onDelete, onResetPassword, onMobileBack }: UserDetailPaneProps) {
   if (!user) {
     return (
       <div className="h-full flex items-center justify-center p-10">
@@ -443,11 +471,20 @@ function UserDetailPane({ user, onPatch, onDelete, onMobileBack }: UserDetailPan
           )}
           <button
             type="button"
-            onClick={() => onDelete(user.id)}
-            className="px-3 h-7 rounded-md text-xs font-medium bg-canvas border border-red-200 text-red-700 dark:text-red-300 hover:bg-red-50 dark:hover:bg-red-500/15 transition-colors whitespace-nowrap"
+            onClick={() => onResetPassword(user)}
+            className="px-3 h-7 rounded-md text-xs font-medium bg-canvas border border-hairline text-slate-700 hover:bg-surface transition-colors whitespace-nowrap"
           >
-            削除
+            パスワード
           </button>
+          {user.id !== 'local' && (
+            <button
+              type="button"
+              onClick={() => onDelete(user.id)}
+              className="px-3 h-7 rounded-md text-xs font-medium bg-canvas border border-red-200 text-red-700 dark:text-red-300 hover:bg-red-50 dark:hover:bg-red-500/15 transition-colors whitespace-nowrap"
+            >
+              削除
+            </button>
+          )}
         </div>
       </div>