diff --git a/packages/backend/package.json b/packages/backend/package.json
index d64fcc3d2a..7f70ae0c97 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -11,14 +11,14 @@
 		"start:test": "cross-env NODE_ENV=test node ./built/boot/entry.js",
 		"migrate": "pnpm typeorm migration:run -d ormconfig.js",
 		"revert": "pnpm typeorm migration:revert -d ormconfig.js",
-		"check:connect": "node ./check_connect.js",
+		"check:connect": "node ./scripts/check_connect.js",
 		"build": "swc src -d built -D",
 		"build:test": "swc test-server -d built-test -D --config-file test-server/.swcrc",
 		"watch:swc": "swc src -d built -D -w",
 		"build:tsc": "tsc -p tsconfig.json && tsc-alias -p tsconfig.json",
-		"watch": "node watch.mjs",
+		"watch": "node ./scripts/watch.mjs",
 		"restart": "pnpm build && pnpm start",
-		"dev": "nodemon -w src -e ts,js,mjs,cjs,json --exec \"cross-env NODE_ENV=development pnpm run restart\"",
+		"dev": "node ./scripts/dev.mjs",
 		"typecheck": "tsc --noEmit && tsc -p test --noEmit",
 		"eslint": "eslint --quiet \"src/**/*.ts\"",
 		"lint": "pnpm typecheck && pnpm eslint",
@@ -31,7 +31,7 @@
 		"test:e2e": "pnpm build && pnpm build:test && pnpm jest:e2e",
 		"test-and-coverage": "pnpm jest-and-coverage",
 		"test-and-coverage:e2e": "pnpm build && pnpm build:test && pnpm jest-and-coverage:e2e",
-		"generate-api-json": "pnpm build && node ./generate_api_json.js"
+		"generate-api-json": "pnpm build && node ./scripts/generate_api_json.js"
 	},
 	"optionalDependencies": {
 		"@swc/core-android-arm64": "1.3.11",
diff --git a/packages/backend/check_connect.js b/packages/backend/scripts/check_connect.js
similarity index 85%
rename from packages/backend/check_connect.js
rename to packages/backend/scripts/check_connect.js
index d88e649c09..ba25fd416c 100644
--- a/packages/backend/check_connect.js
+++ b/packages/backend/scripts/check_connect.js
@@ -4,7 +4,7 @@
  */
 
 import Redis from 'ioredis';
-import { loadConfig } from './built/config.js';
+import { loadConfig } from '../built/config.js';
 
 const config = loadConfig();
 const redis = new Redis(config.redis);
diff --git a/packages/backend/scripts/dev.mjs b/packages/backend/scripts/dev.mjs
new file mode 100644
index 0000000000..2d0de0f916
--- /dev/null
+++ b/packages/backend/scripts/dev.mjs
@@ -0,0 +1,61 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { execa, execaNode } from 'execa';
+
+/** @type {import('execa').ExecaChildProcess | undefined} */
+let backendProcess;
+
+async function execBuildAssets() {
+	await execa('pnpm', ['run', 'build-assets'], {
+		cwd: '../../',
+		stdout: process.stdout,
+		stderr: process.stderr,
+	})
+}
+
+function execStart() {
+	// pnpm run start を呼び出したいが、windowsだとプロセスグループ単位でのkillが出来ずゾンビプロセス化するので
+	// 上記と同等の動きをするコマンドで子・孫プロセスを作らないようにしたい
+	backendProcess = execaNode('./built/boot/entry.js', [], {
+		stdout: process.stdout,
+		stderr: process.stderr,
+		env: {
+			'NODE_ENV': 'development',
+		},
+	});
+}
+
+async function killProc() {
+	if (backendProcess) {
+		backendProcess.kill();
+		await new Promise(resolve => backendProcess.on('exit', resolve));
+		backendProcess = undefined;
+	}
+}
+
+(async () => {
+	execaNode(
+		'./node_modules/nodemon/bin/nodemon.js',
+		[
+			'-w', 'src',
+			'-e', 'ts,js,mjs,cjs,json',
+			'--exec', 'pnpm', 'run', 'build',
+		],
+		{
+			stdio: [process.stdin, process.stdout, process.stderr, 'ipc'],
+		})
+		.on('message', async (message) => {
+			if (message.type === 'exit') {
+				// かならずbuild->build-assetsの順番で呼び出したいので、
+				// 少々トリッキーだがnodemonからのexitイベントを利用してbuild-assets->startを行う。
+				// pnpm restartをbuildが終わる前にbuild-assetsが動いてしまうので、バラバラに呼び出す必要がある
+
+				await killProc();
+				await execBuildAssets();
+				execStart();
+			}
+		})
+})();
diff --git a/packages/backend/generate_api_json.js b/packages/backend/scripts/generate_api_json.js
similarity index 70%
rename from packages/backend/generate_api_json.js
rename to packages/backend/scripts/generate_api_json.js
index 602ced1d75..b4769ef801 100644
--- a/packages/backend/generate_api_json.js
+++ b/packages/backend/scripts/generate_api_json.js
@@ -3,8 +3,8 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { loadConfig } from './built/config.js'
-import { genOpenapiSpec } from './built/server/api/openapi/gen-spec.js'
+import { loadConfig } from '../built/config.js'
+import { genOpenapiSpec } from '../built/server/api/openapi/gen-spec.js'
 import { writeFileSync } from "node:fs";
 
 const config = loadConfig();
diff --git a/packages/backend/watch.mjs b/packages/backend/scripts/watch.mjs
similarity index 100%
rename from packages/backend/watch.mjs
rename to packages/backend/scripts/watch.mjs
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 46512784c3..91c2a704e2 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -6678,7 +6678,7 @@ packages:
       ts-dedent: 2.2.0
       type-fest: 2.19.0
       vue: 3.4.21(typescript@5.3.3)
-      vue-component-type-helpers: 2.0.6
+      vue-component-type-helpers: 2.0.7
     transitivePeerDependencies:
       - encoding
       - supports-color
@@ -19348,8 +19348,8 @@ packages:
     resolution: {integrity: sha512-6bnLkn8O0JJyiFSIF0EfCogzeqNXpnjJ0vW/SZzNHfe6sPx30lTtTXlE5TFs2qhJlAtDFybStVNpL73cPe3OMQ==}
     dev: true
 
-  /vue-component-type-helpers@2.0.6:
-    resolution: {integrity: sha512-qdGXCtoBrwqk1BT6r2+1Wcvl583ZVkuSZ3or7Y1O2w5AvWtlvvxwjGhmz5DdPJS9xqRdDlgTJ/38ehWnEi0tFA==}
+  /vue-component-type-helpers@2.0.7:
+    resolution: {integrity: sha512-7e12Evdll7JcTIocojgnCgwocX4WzIYStGClBQ+QuWPinZo/vQolv2EMq4a3lg16TKfwWafLimG77bxb56UauA==}
     dev: true
 
   /vue-demi@0.14.7(vue@3.4.21):