diff --git a/apps/stage-pocket/package.json b/apps/stage-pocket/package.json
index 479df2868..2764bb25f 100644
--- a/apps/stage-pocket/package.json
+++ b/apps/stage-pocket/package.json
@@ -44,6 +44,7 @@
     "@proj-airi/stage-layouts": "workspace:^",
     "@proj-airi/stage-shared": "workspace:^",
     "@proj-airi/stage-ui": "workspace:^",
+    "@proj-airi/stage-ui-live2d": "workspace:^",
     "@proj-airi/stage-ui-three": "workspace:^",
     "@proj-airi/stream-kit": "workspace:^",
     "@proj-airi/ui": "workspace:^",
diff --git a/apps/stage-pocket/src/pages/devtools/polaroid.vue b/apps/stage-pocket/src/pages/devtools/polaroid.vue
index 4d20356f4..de3898d09 100644
--- a/apps/stage-pocket/src/pages/devtools/polaroid.vue
+++ b/apps/stage-pocket/src/pages/devtools/polaroid.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
-import { Live2DCanvas, Live2DModel } from '@proj-airi/stage-ui/components/scenes'
-import { useSettings } from '@proj-airi/stage-ui/stores/settings'
+import { Live2DCanvas, Live2DModel } from '@proj-airi/stage-ui-live2d/components/scenes/live2d'
+import { useSettingsStageModel } from '@proj-airi/stage-ui/stores/settings/stage-model'
 import { Screen } from '@proj-airi/ui'
 import { storeToRefs } from 'pinia'
 import { ref, watch } from 'vue'
@@ -8,8 +8,8 @@ import { ref, watch } from 'vue'
 const live2dCanvasRef = ref<InstanceType<typeof Live2DCanvas>>()
 const live2dModelRef = ref<InstanceType<typeof Live2DModel>>()
 
-const settingsStore = useSettings()
-const { stageModelSelectedUrl } = storeToRefs(settingsStore)
+const settingsStore = useSettingsStageModel()
+const { stageModelSelected, stageModelSelectedUrl } = storeToRefs(settingsStore)
 const motion = ref<string>('idle')
 const motionGroupsList = ref<{
   motionName: string
@@ -65,6 +65,7 @@ function handleShot() {
         >
           <Live2DModel
             ref="live2dModelRef"
+            :model-id="stageModelSelected"
             :model-src="stageModelSelectedUrl"
             :app="app"
             :width="width"
diff --git a/apps/stage-web/package.json b/apps/stage-web/package.json
index 7120626af..085a803a6 100644
--- a/apps/stage-web/package.json
+++ b/apps/stage-web/package.json
@@ -15,6 +15,8 @@
     "dev:https": "vite --host -- --mkcert",
     "lint": "eslint .",
     "preview": "vite preview",
+    "test": "vitest",
+    "test:run": "vitest run",
     "typecheck": "vue-tsc --noEmit"
   },
   "dependencies": {
diff --git a/apps/stage-web/src/pages/devtools/polaroid.browser.test.ts b/apps/stage-web/src/pages/devtools/polaroid.browser.test.ts
new file mode 100644
index 000000000..85f79edda
--- /dev/null
+++ b/apps/stage-web/src/pages/devtools/polaroid.browser.test.ts
@@ -0,0 +1,129 @@
+import type { Component } from 'vue'
+
+import { DisplayModelFormat, useDisplayModelsStore } from '@proj-airi/stage-ui/stores/display-models'
+import { useSettingsStageModel } from '@proj-airi/stage-ui/stores/settings/stage-model'
+import { createPinia } from 'pinia'
+import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it } from 'vitest'
+import { createApp } from 'vue'
+
+import PocketPolaroid from '../../../../stage-pocket/src/pages/devtools/polaroid.vue'
+import WebPolaroid from './polaroid.vue'
+
+import 'virtual:uno.css'
+
+let presetArchive: Blob
+const layoutStyle = document.createElement('style')
+
+beforeAll(async () => {
+  layoutStyle.textContent = `
+    .polaroid-browser-test {
+      height: 700px;
+      overflow: hidden;
+      width: 800px;
+    }
+
+    .polaroid-browser-test > div {
+      height: 700px !important;
+      width: 800px !important;
+    }
+
+    .polaroid-browser-test > div > div:first-child {
+      flex: none !important;
+      height: 600px !important;
+      width: 800px !important;
+    }
+  `
+  document.head.appendChild(layoutStyle)
+
+  await import('@proj-airi/stage-ui-live2d/utils/live2d-zip-loader')
+  await import('@proj-airi/stage-ui-live2d/utils/live2d-opfs-registration')
+
+  const pinia = createPinia()
+  const displayModels = useDisplayModelsStore(pinia)
+  const preset = await displayModels.getDisplayModel('preset-live2d-2')
+  if (preset?.type !== 'url')
+    throw new Error('The Live2D test preset is unavailable.')
+
+  const response = await fetch(preset.url)
+  if (!response.ok)
+    throw new Error(`Failed to load the Live2D test preset: ${response.status}`)
+
+  presetArchive = await response.blob()
+})
+
+beforeEach(() => {
+  localStorage.removeItem('settings/stage/model')
+})
+
+afterEach(() => {
+  localStorage.removeItem('settings/stage/model')
+})
+
+afterAll(() => {
+  layoutStyle.remove()
+})
+
+async function renderPolaroid(component: Component, modelId: string) {
+  const pinia = createPinia()
+  const displayModels = useDisplayModelsStore(pinia)
+  const settings = useSettingsStageModel(pinia)
+  const file = new File([presetArchive], 'imported-live2d.zip', { type: 'application/zip' })
+  const container = document.createElement('div')
+  container.className = 'polaroid-browser-test'
+  document.body.appendChild(container)
+
+  // NOTICE:
+  // Keep each app mounted until Vitest closes the browser page. Vue DevTools
+  // schedules inspector work after app.unmount(), which rejects after teardown.
+  // Source/context: the Stage Web Vite config used by this browser test.
+  // Removal condition: Vue DevTools supports component-test app teardown.
+  const app = createApp(component)
+  app.use(pinia)
+  app.mount(container)
+
+  displayModels.displayModels.unshift({
+    id: modelId,
+    format: DisplayModelFormat.Live2dZip,
+    type: 'file',
+    file,
+    name: file.name,
+    importedAt: Date.now(),
+  })
+
+  settings.stageModelSelected = modelId
+  await settings.updateStageModel()
+  await expect.poll(() => settings.stageModelSelectedUrl).toMatch(/^blob:/)
+
+  return container
+}
+
+async function expectImportedModelPhoto(component: Component, modelId: string) {
+  const container = await renderPolaroid(component, modelId)
+
+  await expect.poll(() => container.querySelector('option'), { timeout: 20_000 }).toBeInstanceOf(HTMLOptionElement)
+
+  const canvas = container.querySelector('canvas')
+  if (!(canvas instanceof HTMLCanvasElement))
+    throw new TypeError('Polaroid did not render a canvas.')
+
+  expect(canvas.toDataURL('image/png')).toMatch(/^data:image\/png;base64,./)
+}
+
+describe('polaroid imported Live2D model', () => {
+  it('loads and captures an imported model on the web page', async () => {
+    // ROOT CAUSE:
+    //
+    // Polaroid passed only the object URL to the Live2D loader. An imported
+    // model uses a blob URL without the .zip suffix, so the loader also needs
+    // the selected display model ID to resolve the archive from OPFS.
+    //
+    // The loader also kept its mutex locked when the first render had no model
+    // source. We fixed both paths by passing the selected ID and releasing the
+    // mutex across every early return.
+    await expectImportedModelPhoto(WebPolaroid, 'display-model-polaroid-web')
+  })
+
+  it('loads and captures an imported model on the pocket page', async () => {
+    await expectImportedModelPhoto(PocketPolaroid, 'display-model-polaroid-pocket')
+  })
+})
diff --git a/apps/stage-web/src/pages/devtools/polaroid.vue b/apps/stage-web/src/pages/devtools/polaroid.vue
index 4d20356f4..de3898d09 100644
--- a/apps/stage-web/src/pages/devtools/polaroid.vue
+++ b/apps/stage-web/src/pages/devtools/polaroid.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
-import { Live2DCanvas, Live2DModel } from '@proj-airi/stage-ui/components/scenes'
-import { useSettings } from '@proj-airi/stage-ui/stores/settings'
+import { Live2DCanvas, Live2DModel } from '@proj-airi/stage-ui-live2d/components/scenes/live2d'
+import { useSettingsStageModel } from '@proj-airi/stage-ui/stores/settings/stage-model'
 import { Screen } from '@proj-airi/ui'
 import { storeToRefs } from 'pinia'
 import { ref, watch } from 'vue'
@@ -8,8 +8,8 @@ import { ref, watch } from 'vue'
 const live2dCanvasRef = ref<InstanceType<typeof Live2DCanvas>>()
 const live2dModelRef = ref<InstanceType<typeof Live2DModel>>()
 
-const settingsStore = useSettings()
-const { stageModelSelectedUrl } = storeToRefs(settingsStore)
+const settingsStore = useSettingsStageModel()
+const { stageModelSelected, stageModelSelectedUrl } = storeToRefs(settingsStore)
 const motion = ref<string>('idle')
 const motionGroupsList = ref<{
   motionName: string
@@ -65,6 +65,7 @@ function handleShot() {
         >
           <Live2DModel
             ref="live2dModelRef"
+            :model-id="stageModelSelected"
             :model-src="stageModelSelectedUrl"
             :app="app"
             :width="width"
diff --git a/apps/stage-web/src/test/setup-live2d.browser.ts b/apps/stage-web/src/test/setup-live2d.browser.ts
new file mode 100644
index 000000000..145735200
--- /dev/null
+++ b/apps/stage-web/src/test/setup-live2d.browser.ts
@@ -0,0 +1,12 @@
+if (!('Live2DCubismCore' in window)) {
+  // eslint-disable-next-line antfu/no-top-level-await
+  await new Promise<void>((resolve, reject) => {
+    const script = document.createElement('script')
+    script.src = '/assets/js/CubismSdkForWeb-5-r.3/Core/live2dcubismcore.min.js'
+    script.addEventListener('load', () => resolve(), { once: true })
+    script.addEventListener('error', () => reject(new Error('Failed to load the Live2D Cubism runtime.')), { once: true })
+    document.head.appendChild(script)
+  })
+}
+
+export {}
diff --git a/apps/stage-web/vitest.config.ts b/apps/stage-web/vitest.config.ts
index 2cfb1ba4a..d8767ea43 100644
--- a/apps/stage-web/vitest.config.ts
+++ b/apps/stage-web/vitest.config.ts
@@ -1,11 +1,38 @@
 import Vue from '@vitejs/plugin-vue'
 
-import { defineConfig } from 'vitest/config'
+import { playwright } from '@vitest/browser-playwright'
+import { defineConfig, mergeConfig } from 'vitest/config'
+
+import stageWebConfig from './vite.config'
 
 export default defineConfig({
   plugins: [Vue()],
   test: {
-    environment: 'jsdom',
-    include: ['src/**/*.test.ts'],
+    projects: [
+      {
+        extends: true,
+        test: {
+          name: 'unit',
+          environment: 'jsdom',
+          include: ['src/**/*.test.ts'],
+          exclude: ['src/**/*.browser.test.ts'],
+        },
+      },
+      mergeConfig(stageWebConfig, defineConfig({
+        test: {
+          name: 'browser',
+          include: ['src/**/*.browser.test.ts'],
+          setupFiles: ['./src/test/setup-live2d.browser.ts'],
+          browser: {
+            enabled: true,
+            headless: true,
+            provider: playwright(),
+            instances: [
+              { browser: 'chromium' },
+            ],
+          },
+        },
+      })),
+    ],
   },
 })
diff --git a/packages/stage-ui-live2d/src/components/scenes/live2d/Model.vue b/packages/stage-ui-live2d/src/components/scenes/live2d/Model.vue
index 402f511ff..e1d67c02e 100644
--- a/packages/stage-ui-live2d/src/components/scenes/live2d/Model.vue
+++ b/packages/stage-ui-live2d/src/components/scenes/live2d/Model.vue
@@ -204,7 +204,15 @@ async function loadModel() {
   await until(modelLoading).not.toBeTruthy()
 
   await modelLoadMutex.acquire()
+  try {
+    await performModelLoad()
+  }
+  finally {
+    modelLoadMutex.release()
+  }
+}
 
+async function performModelLoad() {
   modelLoading.value = true
   componentState.value = 'loading'
 
@@ -447,7 +455,6 @@ async function loadModel() {
     await initExpressionController(internalModelRef.value).catch((err) => {
       console.warn('[Model.vue] Expression controller initialization failed:', err)
     })
-    modelLoadMutex.release()
   }
 }
 
diff --git a/packages/stage-ui/package.json b/packages/stage-ui/package.json
index 6445cd3eb..98e8b390c 100644
--- a/packages/stage-ui/package.json
+++ b/packages/stage-ui/package.json
@@ -42,6 +42,7 @@
     "./tools/mcp": "./src/tools/mcp.ts",
     "./stores/character": "./src/stores/character/index.ts",
     "./stores/settings/analytics": "./src/stores/settings/analytics.ts",
+    "./stores/settings/stage-model": "./src/stores/settings/stage-model.ts",
     "./stores/settings": "./src/stores/settings/index.ts",
     "./stores/modules/vision": "./src/stores/modules/vision/index.ts",
     "./stores/mcp-tool-bridge": "./src/stores/mcp-tool-bridge.ts",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ce4ad2d55..48d698dbb 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1493,6 +1493,9 @@ importers:
       '@proj-airi/stage-ui':
         specifier: workspace:^
         version: link:../../packages/stage-ui
+      '@proj-airi/stage-ui-live2d':
+        specifier: workspace:^
+        version: link:../../packages/stage-ui-live2d
       '@proj-airi/stage-ui-three':
         specifier: workspace:^
         version: link:../../packages/stage-ui-three