diff --git a/backend/app/controllers/posts_controller.rb b/backend/app/controllers/posts_controller.rb
index 70eb22f..00618a1 100644
--- a/backend/app/controllers/posts_controller.rb
+++ b/backend/app/controllers/posts_controller.rb
@@ -5,16 +5,26 @@ require 'nokogiri'
 class PostsController < ApplicationController
   # GET /posts
   def index
-    latest_id = params[:latest].to_i
-    offset = params[:offset].to_i
-
-    posts = filtered_posts.order(created_at: :desc)
-    posts = if posts.first&.id == latest_id
-              posts.limit(20).offset(offset)
-            else
-              posts.limit(offset + 20)
-            end
-    render json: posts.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } })
+    limit = (params[:limit] || 20).to_i
+    cursor = params[:cursor]
+
+    q = filtered_posts.order(created_at: :desc)
+
+    next_cursor = nil
+    if cursor.present?
+      q = q.where('posts.created_at < ?', Time.iso8601(cursor))
+    end
+
+    posts = q.limit(limit + 1)
+
+    next_cursor = nil
+    if posts.size > limit
+      next_cursor = posts.last.created_at.iso8601(6)
+      posts = posts.first(limit)
+    end
+
+    render json: { posts:       posts.as_json(include: { tags: { only: [:id, :name, :category, :post_count] } }),
+                   next_cursor: }
   end
 
   def random
@@ -31,7 +41,10 @@ class PostsController < ApplicationController
   # GET /posts/1
   def show
     post = Post.includes(:tags).find(params[:id])
-    viewed = current_user&.viewed?(post)
+    return head :not_found unless post
+
+    viewed = current_user&.viewed?(post) || false
+
     render json: (post
                   .as_json(include: { tags: { only: [:id, :name, :category] } })
                   .merge(viewed: viewed))
@@ -95,7 +108,7 @@ class PostsController < ApplicationController
   private
 
   def filtered_posts
-    tag_names = params[:tags]&.split(',')
+    tag_names = params[:tags]&.split(?\ )
     match_type = params[:match]
     tag_names.present? ? filter_posts_by_tags(tag_names, match_type) : Post.all
   end
diff --git a/frontend/src/components/TagSidebar.tsx b/frontend/src/components/TagSidebar.tsx
index aaf9aea..e0c2f63 100644
--- a/frontend/src/components/TagSidebar.tsx
+++ b/frontend/src/components/TagSidebar.tsx
@@ -7,6 +7,7 @@ import TagSearch from '@/components/TagSearch'
 import SectionTitle from '@/components/common/SectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { API_BASE_URL } from '@/config'
+import { CATEGORIES } from '@/consts'
 
 import type { Post, Tag } from '@/types'
 
@@ -27,6 +28,8 @@ export default ({ posts }: Props) => {
 
   useEffect (() => {
     const tagsTmp: TagByCategory = { }
+    let cnt = 0
+  loop:
     for (const post of posts)
       {
         for (const tag of post.tags)
@@ -34,7 +37,12 @@ export default ({ posts }: Props) => {
             if (!(tag.category in tagsTmp))
               tagsTmp[tag.category] = []
             if (!(tagsTmp[tag.category].map (t => t.id).includes (tag.id)))
-              tagsTmp[tag.category].push (tag)
+              {
+                tagsTmp[tag.category].push (tag)
+                ++cnt
+                if (cnt >= 25)
+                  break loop
+              }
           }
       }
     for (const cat of Object.keys (tagsTmp))
@@ -47,7 +55,7 @@ export default ({ posts }: Props) => {
         <TagSearch />
         <SectionTitle>タグ</SectionTitle>
         <ul>
-          {['general', 'deerjikist', 'nico'].map (cat => cat in tags && (
+          {CATEGORIES.map (cat => cat in tags && (
               <>
                 {tags[cat].map (tag => (
                     <li key={tag.id} className="mb-1">
diff --git a/frontend/src/pages/posts/PostDetailPage.tsx b/frontend/src/pages/posts/PostDetailPage.tsx
index 2cf6e24..74dafc4 100644
--- a/frontend/src/pages/posts/PostDetailPage.tsx
+++ b/frontend/src/pages/posts/PostDetailPage.tsx
@@ -1,4 +1,5 @@
 import axios from 'axios'
+import toCamel from 'camelcase-keys'
 import React, { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet'
 import { Link, useLocation, useParams } from 'react-router-dom'
@@ -32,9 +33,9 @@ export default ({ user }: Props) => {
         void (axios.delete (
                   `${ API_BASE_URL }/posts/${ id }/viewed`,
                   { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') || '' } })
-              .then (res => setPost (post => ({ ...post, viewed: false })))
-              .catch (err => toast ({ title:        '失敗……',
-                                      description:  '通信に失敗しました……' })))
+              .then (() => setPost (post => ({ ...post, viewed: false })))
+              .catch (() => toast ({ title:        '失敗……',
+                                     description:  '通信に失敗しました……' })))
       }
     else
       {
@@ -42,9 +43,9 @@ export default ({ user }: Props) => {
                   `${ API_BASE_URL }/posts/${ id }/viewed`,
                   { },
                   { headers: { 'X-Transfer-Code': localStorage.getItem ('user_code') || '' } })
-              .then (res => setPost (post => ({ ...post, viewed: true })))
-              .catch (err => toast ({ title:        '失敗……',
-                                      description:  '通信に失敗しました……' })))
+              .then (() => setPost (post => ({ ...post, viewed: true })))
+              .catch (() => toast ({ title:        '失敗……',
+                                     description:  '通信に失敗しました……' })))
       }
   }
 
@@ -53,7 +54,7 @@ export default ({ user }: Props) => {
       return
     void (axios.get (`${ API_BASE_URL }/posts/${ id }`, { headers: {
               'X-Transfer-Code': localStorage.getItem ('user_code') || '' } })
-          .then (res => setPost (res.data))
+          .then (res => setPost (toCamel (res.data, { deep: true })))
           .catch (err => console.error ('うんち!', err)))
   }, [id])
 
@@ -78,6 +79,8 @@ export default ({ user }: Props) => {
   return (
       <>
         <Helmet>
+          {(post?.thumbnail || post?.thumbnailBase) &&
+              <meta name="thumbnail" content={post.thumbnail || post.thumbnailBase} />}
           {post && <title>{`${ post.title || post.url } | ${ SITE_TITLE }`}</title>}
         </Helmet>
         <TagDetailSidebar post={post} />
diff --git a/frontend/src/pages/posts/PostListPage.tsx b/frontend/src/pages/posts/PostListPage.tsx
index 975b61e..97cf00a 100644
--- a/frontend/src/pages/posts/PostListPage.tsx
+++ b/frontend/src/pages/posts/PostListPage.tsx
@@ -1,6 +1,6 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
-import React, { useEffect, useState } from 'react'
+import React, { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet'
 import { Link, useLocation } from 'react-router-dom'
 
@@ -16,6 +16,22 @@ import type { Post, Tag, WikiPage } from '@/types'
 export default () => {
   const [posts, setPosts] = useState<Post[] | null> (null)
   const [wikiPage, setWikiPage] = useState<WikiPage | null> (null)
+  const [cursor, setCursor] = useState ('')
+  const [loading, setLoading] = useState (false)
+
+  const loaderRef = useRef<HTMLDivElement | null> (null)
+
+  const loadMore = async () => {
+    setLoading (true)
+    const res = await axios.get (`${ API_BASE_URL }/posts`, {
+        params: { tags:   tags.join (' '),
+                  match:  (anyFlg ? 'any' : 'all'),
+                  cursor } })
+    const data = toCamel (res.data, { deep: true })
+    setPosts (posts => [...(posts || []), ...data.posts])
+    setCursor (data.nextCursor)
+    setLoading (false)
+  }
 
   const location = useLocation ()
   const query = new URLSearchParams (location.search)
@@ -24,14 +40,22 @@ export default () => {
   const tags = tagsQuery.split (' ').filter (e => e !== '')
 
   useEffect(() => {
-    void (axios.get (`${ API_BASE_URL }/posts`, {
-              params: { tags:   tags.join (','),
-                        match:  (anyFlg ? 'any' : 'all') } })
-          .then (res => setPosts (toCamel (res.data, { deep: true })))
-          .catch (err => {
-            console.error ('Failed to fetch posts:', err)
-            setPosts ([])
-          }))
+    const observer = new IntersectionObserver (entries => {
+      if (entries[0].isIntersecting && !(loading) && cursor)
+        loadMore ()
+    }, { threshold: 1 })
+
+    const target = loaderRef.current
+    target && observer.observe (target)
+
+    return () => target && observer.unobserve (target)
+  }, [loaderRef, loading])
+
+  useEffect (() => {
+    console.log ('test')
+    setCursor ('')
+    setPosts (null)
+    loadMore ()
 
     setWikiPage (null)
     if (tags.length === 1)
@@ -50,10 +74,10 @@ export default () => {
           <title>
             {tags.length
              ? `${ tags.join (anyFlg ? ' or ' : ' and ') } | ${ SITE_TITLE }`
-             : `${ SITE_TITLE }　〜 ぼざクリも、ぼざろ外も、外伝もあるんだよ`}
+             : `${ SITE_TITLE }　〜 ぼざクリ関聯綜合リンク集サイト`}
           </title>
         </Helmet>
-        <TagSidebar posts={posts || []} />
+        <TagSidebar posts={posts?.slice (0, 20) || []} />
         <MainArea>
           <TabGroup key={wikiPage}>
             <Tab name="広場">
@@ -66,10 +90,12 @@ export default () => {
                                  key={post.id}
                                  className="w-40 h-40 overflow-hidden rounded-lg shadow-md hover:shadow-lg">
                              <img src={post.thumbnail ?? post.thumbnailBase}
+                                  alt={post.title || post.url}
                                   className="object-none w-full h-full" />
                            </Link>))}
                      </div>)
                   : '広場には何もありませんよ．')}
+              <div ref={loaderRef} className="h-12"></div>
             </Tab>
             {(wikiPage && wikiPage.body) && (
                 <Tab name="Wiki" init={posts && !(posts.length)}>