diff --git a/package.json b/package.json
index 057ad51..2fccdb1 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "license": "ISC",
   "scripts": {
     "test": "bun test test/**/*.test.js",
-    "setup": "pwsh -File scripts/setup-llama-server-vulkan.ps1 && pwsh -File scripts/setup-model.ps1",
+    "setup": "node scripts/init-env.js && pwsh -File scripts/setup-llama-server-vulkan.ps1 && pwsh -File scripts/setup-model.ps1",
     "dev": "tauri --config src/backend/tauri.conf.json dev",
     "build": "tauri --config src/backend/tauri.conf.json build",
     "tauri": "tauri --config src/backend/tauri.conf.json",
diff --git a/scripts/init-env.js b/scripts/init-env.js
new file mode 100644
index 0000000..2c51a7b
--- /dev/null
+++ b/scripts/init-env.js
@@ -0,0 +1,26 @@
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * 初回セットアップを補助するスクリプト
+ * .env.example があれば .env にコピーする (上書きはしない)
+ */
+
+const projectRoot = process.cwd();
+const examplePath = path.join(projectRoot, '.env.example');
+const envPath = path.join(projectRoot, '.env');
+
+console.log('--- Initializing Environment ---');
+
+if (fs.existsSync(examplePath)) {
+    if (!fs.existsSync(envPath)) {
+        fs.copyFileSync(examplePath, envPath);
+        console.log('✅ Created .env from .env.example');
+    } else {
+        console.log('ℹ️ .env already exists. Skipping copy.');
+    }
+} else {
+    console.warn('⚠️ .env.example not found. Skipping initialization.');
+}
+
+console.log('--- Environment Initialization Complete ---\n');