diff --git a/public/locales/en.json b/public/locales/en.json
new file mode 100644
index 0000000..6c51236
--- /dev/null
+++ b/public/locales/en.json
@@ -0,0 +1,56 @@
+{
+  "intro": {
+    "choice": {
+      "left_door": "Walk toward the glowing door on the left",
+      "right_door": "Walk toward the ordinary door on the right",
+      "search": "Search the room carefully",
+      "stay": "Stay where you are, do nothing"
+    }
+  },
+  "left_door": {
+    "choice": {
+      "handshake": "Shake hands with the stranger",
+      "reject": "Refuse to shake, stay alert"
+    }
+  },
+  "right_door": {
+    "choice": {
+      "continue": "Keep moving forward",
+      "back": "Turn back"
+    }
+  },
+  "trust_ending": {
+    "choice": {
+      "journey": "Embark on a journey of trust (requires trust >= 80)",
+      "leave": "Leave this place"
+    }
+  },
+  "investigation_site": {
+    "choice": {
+      "leave": "Leave the room"
+    }
+  },
+  "desk_detail": {
+    "choice": {
+      "return": "Return to the crime scene",
+      "leave": "Leave"
+    }
+  },
+  "stay": {
+    "choice": {
+      "stand": "Stand up and leave"
+    }
+  },
+  "qte_success": {
+    "choice": {
+      "continue": "Keep moving forward",
+      "back": "Turn back"
+    }
+  },
+  "qte_fail": {
+    "choice": {
+      "continue": "Keep moving forward",
+      "back": "Turn back"
+    }
+  }
+}
\ No newline at end of file
diff --git a/public/locales/ja.json b/public/locales/ja.json
new file mode 100644
index 0000000..87253fe
--- /dev/null
+++ b/public/locales/ja.json
@@ -0,0 +1,56 @@
+{
+  "intro": {
+    "choice": {
+      "left_door": "左にある光るドアへ向かう",
+      "right_door": "右にある普通のドアへ向かう",
+      "search": "部屋を念入りに調べる",
+      "stay": "その場に留まる"
+    }
+  },
+  "left_door": {
+    "choice": {
+      "handshake": "見知らぬ人と握手する",
+      "reject": "握手を断り、警戒を続ける"
+    }
+  },
+  "right_door": {
+    "choice": {
+      "continue": "先へ進む",
+      "back": "引き返す"
+    }
+  },
+  "trust_ending": {
+    "choice": {
+      "journey": "信頼の旅に出る（trust >= 80 が必要）",
+      "leave": "ここを去る"
+    }
+  },
+  "investigation_site": {
+    "choice": {
+      "leave": "部屋を出る"
+    }
+  },
+  "desk_detail": {
+    "choice": {
+      "return": "調査現場に戻る",
+      "leave": "立ち去る"
+    }
+  },
+  "stay": {
+    "choice": {
+      "stand": "立ち上がって去る"
+    }
+  },
+  "qte_success": {
+    "choice": {
+      "continue": "先へ進む",
+      "back": "引き返す"
+    }
+  },
+  "qte_fail": {
+    "choice": {
+      "continue": "先へ進む",
+      "back": "引き返す"
+    }
+  }
+}
\ No newline at end of file
diff --git a/public/locales/zh.json b/public/locales/zh.json
new file mode 100644
index 0000000..30bc673
--- /dev/null
+++ b/public/locales/zh.json
@@ -0,0 +1,56 @@
+{
+  "intro": {
+    "choice": {
+      "left_door": "走向左边那扇发光的门",
+      "right_door": "走向右边那扇普通的门",
+      "search": "仔细搜索房间",
+      "stay": "留在原地，什么也不做"
+    }
+  },
+  "left_door": {
+    "choice": {
+      "handshake": "与陌生人握手",
+      "reject": "拒绝握手，保持警惕"
+    }
+  },
+  "right_door": {
+    "choice": {
+      "continue": "继续前进",
+      "back": "回头"
+    }
+  },
+  "trust_ending": {
+    "choice": {
+      "journey": "开启信任的旅程（需要 trust >= 80）",
+      "leave": "离开这里"
+    }
+  },
+  "investigation_site": {
+    "choice": {
+      "leave": "离开房间"
+    }
+  },
+  "desk_detail": {
+    "choice": {
+      "return": "返回调查现场",
+      "leave": "离开"
+    }
+  },
+  "stay": {
+    "choice": {
+      "stand": "站起来离开"
+    }
+  },
+  "qte_success": {
+    "choice": {
+      "continue": "继续前进",
+      "back": "回头"
+    }
+  },
+  "qte_fail": {
+    "choice": {
+      "continue": "继续前进",
+      "back": "回头"
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/composables/useI18n.ts b/src/composables/useI18n.ts
index 58886dd..d386d69 100644
--- a/src/composables/useI18n.ts
+++ b/src/composables/useI18n.ts
@@ -1,29 +1,62 @@
 import { ref } from 'vue'
-import zh from '@/locales/zh.json'
-import en from '@/locales/en.json'
-import ja from '@/locales/ja.json'
+import zhUI from '@/locales/zh.json'
+import enUI from '@/locales/en.json'
+import jaUI from '@/locales/ja.json'
 
-const messages = { zh, en, ja } as const
+const uiMessages = { zh: zhUI, en: enUI, ja: jaUI } as const
 type Lang = 'zh' | 'en' | 'ja'
 
 const currentLang = ref<Lang>(
-  (localStorage.getItem('lang') as Lang) || 'zh'
+  (localStorage.getItem('lang') as Lang) || 'zh',
 )
 
-export function useI18n() {
-  function t(key: string): string {
-    const parts = key.split('.')
-    let result: any = messages[currentLang.value]
-    for (const p of parts) {
-      result = result?.[p]
+const storyMessages = ref<Record<string, Record<string, any>>>({})
+const storyLoading = new Set<Lang>()
+
+async function loadStoryMessages(lang: Lang) {
+  if (storyMessages.value[lang] || storyLoading.has(lang)) return
+  storyLoading.add(lang)
+  try {
+    const resp = await fetch(`/locales/${lang}.json`)
+    if (resp.ok) {
+      storyMessages.value = {
+        ...storyMessages.value,
+        [lang]: await resp.json(),
+      }
     }
-    return typeof result === 'string' ? result : key
+  } catch {
+    /* story locales optional */
+  } finally {
+    storyLoading.delete(lang)
   }
+}
 
-  function setLang(lang: Lang) {
-    currentLang.value = lang
-    localStorage.setItem('lang', lang)
+loadStoryMessages(currentLang.value)
+
+function t(key: string): string {
+  const parts = key.split('.')
+
+  let result: any = storyMessages.value[currentLang.value]
+  for (const p of parts) {
+    result = result?.[p]
   }
+  if (typeof result === 'string') return result
 
+  let fallback: any = uiMessages[currentLang.value]
+  for (const p of parts) {
+    fallback = fallback?.[p]
+  }
+  if (typeof fallback === 'string') return fallback
+
+  return key
+}
+
+async function setLang(lang: Lang) {
+  await loadStoryMessages(lang)
+  currentLang.value = lang
+  localStorage.setItem('lang', lang)
+}
+
+export function useI18n() {
   return { t, currentLang, setLang }
 }
diff --git a/src/locales/en.json b/src/locales/en.json
index 536b695..1de726b 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -19,61 +19,5 @@
     "speed": "Speed",
     "noAutoSave": "No auto save yet",
     "autoSaveHint": "Game auto-saves to slot 0 at each scene change"
-  },
-  "scene": {
-    "intro": {
-      "choice": {
-        "left_door": "Walk toward the glowing door on the left",
-        "right_door": "Walk toward the ordinary door on the right",
-        "search": "Search the room carefully",
-        "stay": "Stay where you are, do nothing"
-      }
-    },
-    "left_door": {
-      "choice": {
-        "handshake": "Shake hands with the stranger",
-        "reject": "Refuse to shake, stay alert"
-      }
-    },
-    "right_door": {
-      "choice": {
-        "continue": "Keep moving forward",
-        "back": "Turn back"
-      }
-    },
-    "trust_ending": {
-      "choice": {
-        "journey": "Embark on a journey of trust (requires trust >= 80)",
-        "leave": "Leave this place"
-      }
-    },
-    "investigation_site": {
-      "choice": {
-        "leave": "Leave the room"
-      }
-    },
-    "desk_detail": {
-      "choice": {
-        "return": "Return to the crime scene",
-        "leave": "Leave"
-      }
-    },
-    "stay": {
-      "choice": {
-        "stand": "Stand up and leave"
-      }
-    },
-    "qte_success": {
-      "choice": {
-        "continue": "Keep moving forward",
-        "back": "Turn back"
-      }
-    },
-    "qte_fail": {
-      "choice": {
-        "continue": "Keep moving forward",
-        "back": "Turn back"
-      }
-    }
   }
-}
+}
\ No newline at end of file
diff --git a/src/locales/ja.json b/src/locales/ja.json
index 0b7041a..8adef8f 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -19,61 +19,5 @@
     "speed": "倍速",
     "noAutoSave": "オートセーブがありません",
     "autoSaveHint": "シーン切替時にスロット0に自動保存されます"
-  },
-  "scene": {
-    "intro": {
-      "choice": {
-        "left_door": "左にある光るドアへ向かう",
-        "right_door": "右にある普通のドアへ向かう",
-        "search": "部屋を念入りに調べる",
-        "stay": "その場に留まる"
-      }
-    },
-    "left_door": {
-      "choice": {
-        "handshake": "見知らぬ人と握手する",
-        "reject": "握手を断り、警戒を続ける"
-      }
-    },
-    "right_door": {
-      "choice": {
-        "continue": "先へ進む",
-        "back": "引き返す"
-      }
-    },
-    "trust_ending": {
-      "choice": {
-        "journey": "信頼の旅に出る（trust >= 80 が必要）",
-        "leave": "ここを去る"
-      }
-    },
-    "investigation_site": {
-      "choice": {
-        "leave": "部屋を出る"
-      }
-    },
-    "desk_detail": {
-      "choice": {
-        "return": "調査現場に戻る",
-        "leave": "立ち去る"
-      }
-    },
-    "stay": {
-      "choice": {
-        "stand": "立ち上がって去る"
-      }
-    },
-    "qte_success": {
-      "choice": {
-        "continue": "先へ進む",
-        "back": "引き返す"
-      }
-    },
-    "qte_fail": {
-      "choice": {
-        "continue": "先へ進む",
-        "back": "引き返す"
-      }
-    }
   }
-}
+}
\ No newline at end of file
diff --git a/src/locales/zh.json b/src/locales/zh.json
index 6205b53..705e0f5 100644
--- a/src/locales/zh.json
+++ b/src/locales/zh.json
@@ -19,61 +19,5 @@
     "speed": "倍速",
     "noAutoSave": "暂无自动存档",
     "autoSaveHint": "游戏会在每次场景切换时自动保存到槽位 0"
-  },
-  "scene": {
-    "intro": {
-      "choice": {
-        "left_door": "走向左边那扇发光的门",
-        "right_door": "走向右边那扇普通的门",
-        "search": "仔细搜索房间",
-        "stay": "留在原地，什么也不做"
-      }
-    },
-    "left_door": {
-      "choice": {
-        "handshake": "与陌生人握手",
-        "reject": "拒绝握手，保持警惕"
-      }
-    },
-    "right_door": {
-      "choice": {
-        "continue": "继续前进",
-        "back": "回头"
-      }
-    },
-    "trust_ending": {
-      "choice": {
-        "journey": "开启信任的旅程（需要 trust >= 80）",
-        "leave": "离开这里"
-      }
-    },
-    "investigation_site": {
-      "choice": {
-        "leave": "离开房间"
-      }
-    },
-    "desk_detail": {
-      "choice": {
-        "return": "返回调查现场",
-        "leave": "离开"
-      }
-    },
-    "stay": {
-      "choice": {
-        "stand": "站起来离开"
-      }
-    },
-    "qte_success": {
-      "choice": {
-        "continue": "继续前进",
-        "back": "回头"
-      }
-    },
-    "qte_fail": {
-      "choice": {
-        "continue": "继续前进",
-        "back": "回头"
-      }
-    }
   }
-}
+}
\ No newline at end of file