diff --git a/assets/js/misc/index.ts b/assets/js/misc/index.ts
index 94a49671..e9b6f873 100644
--- a/assets/js/misc/index.ts
+++ b/assets/js/misc/index.ts
@@ -1,3 +1,5 @@
+import type { NavItem } from '@nuxt/content/dist/runtime/types';
+
 export function resolveObjPath(o: object, s: string): any {
     s = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
     s = s.replace(/^\./, '');           // strip a leading dot
@@ -40,7 +42,7 @@ export function isLocalPath(link: string, base?: string): boolean {
     
 }
 
-export const findDeepObject = (obj: Record<string, any>, condition: (v: any) => boolean): Record<string, any> | null => {
+export const findDeepObject = (obj: NavItem, condition: (v: NavItem) => boolean): NavItem | null => {
 	if (condition(obj)) {
 		return obj;
 	}
diff --git a/components/content/ApiPermissions.vue b/components/content/ApiPermissions.vue
index 829ba6f2..9718d189 100644
--- a/components/content/ApiPermissions.vue
+++ b/components/content/ApiPermissions.vue
@@ -2,14 +2,14 @@
     <table>
         <thead>
             <tr>
-                <th>Permisson</th>
-                <th>Description</th>
+                <th>{{ $t('_api._permissions.title') }}</th>
+                <th>{{ $t('_api._permissions.description') }}</th>
             </tr>
         </thead>
         <tbody>
             <tr v-for="permission in permissions">
                 <td><code>{{ permission }}</code></td>
-                <td>{{ $t(`_api._permissions.${permission}`) }}</td>
+                <td>{{ $t(`_api._permissions._types.${permission}`) }}</td>
             </tr>
         </tbody>
     </table>
diff --git a/components/docs/AsideNav.vue b/components/docs/AsideNav.vue
index 07a695d6..2282c1e2 100644
--- a/components/docs/AsideNav.vue
+++ b/components/docs/AsideNav.vue
@@ -1,61 +1,78 @@
 <template>
-    <ul class="toc-links mb-4 space-y-2">
+    <ul class="toc-links text-sm" :class="[
+        `depth-${depth}`,
+        depth === 1 ? 'mb-4' : 'mb-2',
+    ]">
         <li
-            v-for="link in findDeepObject((links[0] as NavItem), (v) => realBasePath.replace(/\/$/, '') === v?._path.replace(/\/$/, ''))?.children ?? []"
+            v-for="link in realLinks ?? []"
             :key="link.text"
-            :class="[`depth-${link.depth}`]"
+            :class="[
+                depth === 2 && 'border-l-2 flex flex-col',
+                path.includes(link._path) ? 'border-accent-500' : 'border-gray-300',
+            ]"
         >
             <GNuxtLink
                 :to="link._path"
                 @click.passive="emit('child-click');"
-                :class="['hover:text-accent-600']"
+                :class="[
+                    'block hover:text-accent-600',
+                    depth === 1 && 'text-base',
+                    depth === 2 ? 'px-2 py-1' : 'py-1',
+                    isSamePath(path, link._path) && 'text-accent-600 font-bold',
+                ]"
             >
-                {{ link.text }}
+                <div class="flex">
+                    <div v-if="link.children && link.children.filter((v) => !isSamePath(v._path, link._path)).length > 0" class="mr-2">
+                        <ArrowIco 
+                            :class="[
+                                'transition-transform',
+                                path.includes(link._path) && 'rotate-90'
+                            ]"
+                        />
+                    </div>
+                    <div>{{ link.title }}</div>
+                </div>
             </GNuxtLink>
             <AsideNav
-                class="mt-2"
-                v-if="link.children"
-                :links="link.children"
+                v-if="link.children && link.children.filter((v) => !isSamePath(v._path, link._path)).length > 0"
+                v-show="path.includes(link._path)"
+                :links="[link]"
+                :depth="depth + 1"
             />
         </li>
     </ul>
 </template>
 
 <script setup lang="ts">
-import type { PropType } from 'vue'
 import type { NavItem } from '@nuxt/content/dist/runtime/types'
-import { findDeepObject } from 'assets/js/misc';
+import { findDeepObject } from '@/assets/js/misc';
+import { isSamePath } from 'ufo';
+import ArrowIco from "bi/chevron-right.svg";
 
-const props = defineProps({
-    links: {
-        type: Array as PropType<NavItem[]>,
-        default: () => []
-    },
-    basePath: {
-        type: String,
-        default: '',
-    }
+const props = withDefaults(defineProps<{
+    links: NavItem[];
+    depth?: number;
+}>(), {
+    depth: 1,
 });
 
 const { locale } = useI18n();
-const route = useRoute();
+const { path } = useRoute();
 
-const realBasePath = computed<string>(() => {
-    if (props.basePath) {
-        return props.basePath;
+const realLinks = findDeepObject(props.links[0], (v) => {
+    if (props.depth === 1) {
+        return isSamePath(`/${locale.value}/docs/`, v._path);
+    } else {
+        return v._path.includes(props.links[0]._path);
     }
-    return route.path.replace(/^.*\/docs/, `/${locale.value}/docs`);
-});
+})?.children?.filter((v) => !isSamePath(v._path, props.links[0]._path));
 
 const emit = defineEmits(['move', 'child-click']);
 
 </script>
 
 <style scoped>
-.toc-links ::v-deep(.depth-3) {
-    @apply ml-2;
-}
-.toc-links ::v-deep(.depth-4) {
-    @apply ml-4;
+.toc-links:not(.depth-1) {
+    @apply ml-6;
 }
 </style>
\ No newline at end of file
diff --git a/components/g/Nav.vue b/components/g/Nav.vue
index 046a9719..28016241 100644
--- a/components/g/Nav.vue
+++ b/components/g/Nav.vue
@@ -9,7 +9,7 @@
             </div>
             <ul class="hidden lg:col-span-4 lg:space-x-8 xl:space-x-10 lg:flex justify-center">
                 <li v-for="item in NavData.center">
-                    <GNuxtLink :to="localePath(item.to)" :class="['rounded-full px-4 py-1.5 hover:bg-slate-300 dark:hover:bg-slate-800 hover:bg-opacity-50 bg-blend-multiply', { 'bg-slate-200 dark:bg-slate-800 font-bold': currentPath.replace(/\/$/, '').includes(localePath(item.to).replace(/\/$/, '')) }]">
+                    <GNuxtLink :to="localePath(item.to)" :class="['rounded-full px-4 py-1.5 hover:bg-slate-300 dark:hover:bg-slate-800 hover:bg-opacity-50 bg-blend-multiply', { 'bg-slate-200 dark:bg-slate-800 font-bold': currentPath.includes(item.to) }]">
                         <component v-if="item.icon" :is="item.icon" class="h-5 w-5" />
                         <template v-else>
                             {{ $t(item.i18n) }}
@@ -77,9 +77,11 @@ const { locales, locale: currentLocale } = useI18n();
 const { path } = useRoute();
 const { afterEach } = useRouter();
 const currentPath = ref(path);
+
 afterEach((to) => {
     currentPath.value = to.path;
-})
+});
+
 const switchLocalePath = useSwitchLocalePath();
 const localePath = useLocalePath();
 
diff --git a/content/ja/docs/4.for-developers/_dir.yml b/content/ja/docs/4.for-developers/_dir.yml
new file mode 100644
index 00000000..50c436bc
--- /dev/null
+++ b/content/ja/docs/4.for-developers/_dir.yml
@@ -0,0 +1,2 @@
+title: "開発者向け"
+description: "プラグイン・Play開発者や、APIを利用した外部アプリケーションの開発者向けリソース。"
\ No newline at end of file
diff --git a/error.vue b/error.vue
index 003cf3b1..9ed91af7 100644
--- a/error.vue
+++ b/error.vue
@@ -2,5 +2,10 @@
 	<div class="text-slate-800 dark:text-slate-200 bg-slate-100 dark:bg-gray-900">
 		<noscript class="block bg-accent-800 text-white text-center py-1.5 px-3 keep-all relative z-[10005]">Please turn on Javascript from your browser's settings.</noscript>
         ページが見つかりませんでした
+		<pre>{{ error }}</pre>
 	</div>
 </template>
+
+<script setup lang="ts">
+const error = useError();
+</script>
\ No newline at end of file
diff --git a/layouts/docs.vue b/layouts/docs.vue
index 619178ff..0836a8c3 100644
--- a/layouts/docs.vue
+++ b/layouts/docs.vue
@@ -6,13 +6,40 @@ useHead({
         class: 'scroll-pt-32 lg:scroll-pt-20',
     },
 });
+
+const { locale } = useI18n();
+const { data: navigation } = await useAsyncData('navigation', () => fetchContentNavigation(queryContent(`/${locale.value}/docs/`)));
 </script>
+
 <template>
     <div class="bg-white dark:bg-slate-950">
         <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" />
         <div class="main-content">
-            <slot></slot>
+            <div class="relative container mx-auto max-w-screen-xl p-6 lg:py-0 grid docs-root pb-12">
+                <slot name="spToc"></slot>
+                <div class="hidden lg:block">
+                    <slot name="right">
+                        <div class="sticky top-16 h-[calc(100vh-4rem)] overflow-y-scroll border-r border-slate-200 dark:border-slate-700 py-6 pr-3">
+                            <DocsAsideNav :links="navigation ?? []" />
+                        </div>
+                    </slot>
+                </div>
+                <div class="pt-6 lg:p-6 w-full overflow-x-hidden">
+                    <slot name="main"></slot>
+                </div>
+                <div class="hidden lg:block text-sm">
+                    <slot name="left"></slot>
+                </div>
+            </div>
         </div>
         <GFooter class="bg-slate-100 dark:bg-gray-900" />
     </div>
 </template>
+
+<style scoped>
+@screen lg {
+    .docs-root {
+        grid-template-columns: 16rem 1fr 14rem;
+    }
+}
+</style>
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 16fca81b..79b0bf10 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -159,4 +159,8 @@ _links:
     description: "Misskeyに関する質問や会話などをお楽しみいただけます。"
   _aiChan:
     title: "藍"
-    description: "Misskeyの看板娘、藍のウェブサイトです。"
\ No newline at end of file
+    description: "Misskeyの看板娘、藍のウェブサイトです。"
+_api:
+  _permissions:
+    title: "権限"
+    description: "説明"
\ No newline at end of file
diff --git a/package.json b/package.json
index 5ac1e379..e4dd9bbf 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "postinstall": "nuxt prepare"
   },
   "devDependencies": {
+    "@babel/parser": "^7.22.16",
     "@modyfi/vite-plugin-yaml": "^1.0.4",
     "@nuxt/content": "^2.8.0",
     "@nuxtjs/color-mode": "^3.3.0",
diff --git a/pages/docs/[...slug].vue b/pages/docs/[...slug].vue
index 9c30f190..38256891 100644
--- a/pages/docs/[...slug].vue
+++ b/pages/docs/[...slug].vue
@@ -1,19 +1,19 @@
 <template>
-    <div class="relative container mx-auto max-w-screen-xl p-6 lg:py-0 grid docs-root pb-12">
-        <div v-if="data?.body" class="lg:hidden sticky top-16 -mx-6 -mt-6 bg-white px-6 bg-opacity-60 backdrop-blur-lg z-[9890] border-b text-sm">
-            <details :open="openState">
-                <summary class="py-4 cursor-pointer">{{ $t('_docs._toc.title') }}</summary>
-                <div class="pb-4 overflow-y-auto">
-                    <DocsTocLinks :links="data?.body.toc.links" @child-click="openState = false" />
-                </div>
-            </details>
-        </div>
-        <div class="hidden lg:block">
-            <div class="sticky top-16 h-[calc(100vh-4rem)] overflow-y-scroll border-r border-slate-200 dark:border-slate-700 py-6 pr-6">
-                <DocsAsideNav :links="navigation" />
+    <NuxtLayout name="docs">
+        <template #spToc>
+            <div v-if="data?.body" class="lg:hidden sticky top-16 -mx-6 -mt-6 bg-white px-6 bg-opacity-60 backdrop-blur-lg z-[9890] border-b text-sm">
+                <details :open="openState">
+                    <summary class="py-4 cursor-pointer">
+                        {{ $t('_docs._toc.title') }}
+                    </summary>
+                    <div class="pb-4 overflow-y-auto">
+                        <DocsTocLinks :links="data?.body.toc.links" @child-click="openState = false" />
+                    </div>
+                </details>
             </div>
-        </div>
-        <div class="pt-6 lg:p-6 w-full overflow-x-hidden">
+        </template>
+
+        <template #main>
             <template v-if="data?.body">
                 <ContentRenderer v-if="data.body.children.length > 0" :value="data" class="markdown-body w-full mb-6">
                 </ContentRenderer>
@@ -25,14 +25,15 @@
                     <MkIndex :is-dir="data?._file?.endsWith('index.md') || (!data?._file)" />
                 </div>
             </template>
-        </div>
-        <div class="hidden lg:block text-sm">
+        </template>
+
+        <template #left>
             <div class="sticky top-16 h-[calc(100vh-4rem)] overflow-y-auto py-6 pl-6">
                 <h3 class="font-bold mb-6">{{ $t('_docs._toc.title') }}</h3>
                 <DocsTocLinks v-if="data?.body" :links="data?.body.toc.links" class="break-words" />
             </div>
-        </div>
-    </div>
+        </template>
+    </NuxtLayout>
 </template>
 
 <script setup lang="ts">
@@ -42,7 +43,7 @@ const { locale, locales } = useI18n();
 const openState = ref<boolean>(false);
 
 definePageMeta({
-    layout: 'docs',
+    layout: false,
 });
 
 defineI18nRoute({
@@ -55,7 +56,6 @@ const route = useRoute();
 const slugs = (route.params.slug as string[]).filter((v) => v !== '');
 
 const { data } = await useAsyncData(`blog-${locale.value}-${slugs.join('-')}`, () => queryContent(`/${locale.value}/docs/${slugs.join('/')}`).findOne());
-const { data: navigation } = await useAsyncData('navigation', () => fetchContentNavigation(queryContent(`/${locale.value}/docs/${slugs[0]}`)));
 
 if (!data.value) {
     throw createError({ statusCode: 404, statusMessage: 'page not found' });
@@ -63,11 +63,3 @@ if (!data.value) {
 
 route.meta.title = data.value?.title;
 </script>
-
-<style scoped>
-@screen lg {
-    .docs-root {
-        grid-template-columns: 14rem 1fr 14rem;
-    }
-}
-</style>
\ No newline at end of file
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 81ef4ca3..11c38893 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,6 +10,9 @@ dependencies:
     version: 4.1.0
 
 devDependencies:
+  '@babel/parser':
+    specifier: ^7.22.16
+    version: 7.22.16
   '@modyfi/vite-plugin-yaml':
     specifier: ^1.0.4
     version: 1.0.4(vite@4.4.9)
diff --git a/scripts/gen-api-translations.ts b/scripts/gen-api-translations.ts
index cebc7b11..d6e405cd 100644
--- a/scripts/gen-api-translations.ts
+++ b/scripts/gen-api-translations.ts
@@ -2,7 +2,9 @@
 import { locales } from "@/nuxt.config";
 import * as misskey from "misskey-js";
 import yaml from "js-yaml";
+import fs from "fs";
 import path from "path";
+import { parse } from "@babel/parser";
 
 // オブジェクト obj1 にないキーだけを、元オブジェクトにマージする関数
 function mergeObjects(obj1: Record<string, any>, obj2: Record<string, any>): Record<string, any> {
@@ -27,6 +29,19 @@ export function genApiTranslationFiles() {
     misskey.permissions.forEach((permission) => {
         out._permissions[permission] = 'Untranslated / 未翻訳';
     });
-    
-    // エンティティ(TODO)
+
+    const endpointDTSPath = require.resolve('misskey-js', { paths: ['/built/api.types.d.ts'] });
+    /*
+    const ep = fs.readFileSync(endpointDTSPath, "utf-8");
+    const parsedEP = parse(ep, {
+        sourceType: "module",
+        plugins: [[
+            "typescript", {
+                dts: true,
+            },
+        ]],
+    });
+
+    console.log(JSON.stringify(parsedEP));
+    */
 }