diff --git a/backend/app/controllers/tags_controller.rb b/backend/app/controllers/tags_controller.rb
index 7e04e0e..c48e447 100644
--- a/backend/app/controllers/tags_controller.rb
+++ b/backend/app/controllers/tags_controller.rb
@@ -84,6 +84,7 @@ class TagsController < ApplicationController
         Tag
         .joins(:tag_name)
         .includes(:tag_name, tag_name: :wiki_page)
+        .where(category: [:meme, :character, :material])
         .where(id: tag_ids)
         .order('tag_names.name')
         .distinct
@@ -93,7 +94,12 @@ class TagsController < ApplicationController
         if tags.empty?
           []
         else
-          TagImplication.where(parent_tag_id: tags.map(&:id)).distinct.pluck(:parent_tag_id)
+          TagImplication
+              .joins(:tag)
+              .where(parent_tag_id: tags.map(&:id),
+                     tags: { category: [:meme, :character, :material] })
+              .distinct
+              .pluck(:parent_tag_id)
         end
 
     render json: tags.map { |tag|
@@ -101,6 +107,18 @@ class TagsController < ApplicationController
     }
   end
 
+  def materials_by_name
+    name = params[:name].to_s.strip
+    return head :bad_request if name.blank?
+
+    tag = Tag.joins(:tag_name)
+             .includes(:tag_name, tag_name: :wiki_page)
+             .find_by(tag_names: { name: })
+    return :not_found unless tag
+
+    render json: build_tag_children(tag)
+  end
+
   def autocomplete
     q = params[:q].to_s.strip.sub(/\Anot:/i, '')
 
@@ -210,4 +228,10 @@ class TagsController < ApplicationController
 
     render json: TagRepr.base(tag)
   end
+
+  private
+
+  def build_tag_children tag
+    TagRepr.base(tag).merge(children: tag.children.map { build_tag_children(_1) })
+  end
 end
diff --git a/backend/config/routes.rb b/backend/config/routes.rb
index f724054..fc56aa4 100644
--- a/backend/config/routes.rb
+++ b/backend/config/routes.rb
@@ -13,6 +13,7 @@ Rails.application.routes.draw do
 
       scope :name do
         get ':name/deerjikists', action: :deerjikists_by_name
+        get ':name/materials', action: :materials_by_name
         get ':name', action: :show_by_name
       end
     end
diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 668de02..f306f47 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -10,8 +10,9 @@ import RouteBlockerOverlay from '@/components/RouteBlockerOverlay'
 import TopNav from '@/components/TopNav'
 import { Toaster } from '@/components/ui/toaster'
 import { apiPost, isApiError } from '@/lib/api'
-import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 // import MaterialDetailPage from '@/pages/materials/MaterialDetailPage'
+import MaterialListPage from '@/pages/materials/MaterialListPage'
+import MaterialSearchPage from '@/pages/materials/MaterialSearchPage'
 import NicoTagListPage from '@/pages/tags/NicoTagListPage'
 import NotFound from '@/pages/NotFound'
 import PostDetailPage from '@/pages/posts/PostDetailPage'
@@ -53,6 +54,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <Route path="/tags" element={<TagListPage/>}/>
 	    <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>
 	    <Route path="/theatres/:id" element={<TheatreDetailPage/>}/>
+	    <Route path="/materials" element={<MaterialListPage/>}/>
 	    <Route path="/materials/search" element={<MaterialSearchPage/>}/>
 	    {/* <Route path="/materials/:tagName" element ={<MaterialDetailPage/>}/> */}
 	    <Route path="/wiki" element={<WikiSearchPage/>}/>
diff --git a/frontend/src/components/MaterialSidebar.tsx b/frontend/src/components/MaterialSidebar.tsx
index 8494eb4..ee65d7c 100644
--- a/frontend/src/components/MaterialSidebar.tsx
+++ b/frontend/src/components/MaterialSidebar.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { Fragment, useEffect, useState } from 'react'
 
 import TagLink from '@/components/TagLink'
 import SidebarComponent from '@/components/layout/SidebarComponent'
@@ -13,58 +13,84 @@ type TagWithDepth = Tag & {
     children:     TagWithDepth[] }
 
 
+const setChildrenById = (
+    tags:     TagWithDepth[],
+    targetId: number,
+    children: TagWithDepth[],
+): TagWithDepth[] => (
+    tags.map (tag => {
+      if (tag.id === targetId)
+	return { ...tag, children }
+
+      if (tag.children.length === 0)
+	return tag
+
+      return { ...tag, children: setChildrenById (tag.children, targetId, children) }
+    }))
+
+
 export default (() => {
   const [tags, setTags] = useState<TagWithDepth[]> ([])
   const [openTags, setOpenTags] = useState<Record<number, boolean>> ({ })
   const [tagFetchedFlags, setTagFetchedFlags] = useState<Record<number, boolean>> ({ })
 
+  useEffect (() => {
+    void (async () => {
+      setTags (await apiGet<TagWithDepth[]> ('/tags/with-depth'))
+    }) ()
+  }, [])
+
   const renderTags = (ts: TagWithDepth[], nestLevel = 0): ReactNode => (
-      <>
-	{ts.map (t => (
-	    <>
-	      <li key={t.id}>
-		<a
-		    href="#"
-		    onClick={async e => {
-		      e.preventDefault ()
-		      if (!(tagFetchedFlags[t.id]))
-			{
-			  try
-			  {
-			    const data =
-				await apiGet<TagWithDepth[]> (
-				    '/tags/with-depth', { params: { parent: t.id } })
-			    setTags (prev => {
-			      const rtn = structuredClone (prev)
-			      rtn.find (x => x.id === t.id)!.children = data
-			      return rtn
-			    })
-			    setTagFetchedFlags (prev => ({ ...prev, [t.id]: true }))
-			  }
-			  catch
-			  {
-			    ;
-			  }
-			}
-		      setOpenTags (prev => ({ ...prev, [t.id]: !(prev[t.id]) }))
-		    }}>
-		  {openTags[t.id] ? '-' : '+'}
-		</a>
-		<TagLink
-		    tag={t}
-		    nestLevel={nestLevel}
-		    withCount={false}
-		    withWiki={false}
-		    to={`/materials?tag=${ encodeURIComponent (t.name) }`}/>
-	      </li>
-	      {openTags[t.id] && renderTags (t.children, nestLevel + 1)}
-	    </>))}
-      </>)
+      ts.map (t => (
+	  <Fragment key={t.id}>
+	    <li>
+	      <div className="flex">
+		<div className="flex-none w-4">
+		  {t.hasChildren && (
+		      <a
+			  href="#"
+			  onClick={async e => {
+			    e.preventDefault ()
+			    if (!(tagFetchedFlags[t.id]))
+			      {
+				try
+				{
+				  const data =
+				      await apiGet<TagWithDepth[]> (
+					  '/tags/with-depth', { params: { parent: String (t.id) } })
+				  setTags (prev => setChildrenById (prev, t.id, data))
+				  setTagFetchedFlags (prev => ({ ...prev, [t.id]: true }))
+				}
+				catch
+				{
+				  ;
+				}
+			      }
+			    setOpenTags (prev => ({ ...prev, [t.id]: !(prev[t.id]) }))
+			  }}>
+			{openTags[t.id] ? <>&minus;</> : '+'}
+		      </a>)}
+		</div>
+		<div className="flex-1 truncate">
+		  <TagLink
+		      tag={t}
+		      nestLevel={nestLevel}
+		      title={t.name}
+		      withCount={false}
+		      withWiki={false}
+		      to={`/materials?tag=${ encodeURIComponent (t.name) }`}/>
+		</div>
+	      </div>
+	    </li>
+	    {openTags[t.id] && renderTags (t.children, nestLevel + 1)}
+	  </Fragment>)))
 
   return (
       <SidebarComponent>
-	<ul>
-	  {renderTags (tags)}
-	</ul>
+	<div className="md:h-[calc(100dvh-120px)] md:overflow-y-auto">
+	  <ul>
+	    {renderTags (tags)}
+	  </ul>
+	</div>
       </SidebarComponent>)
 }) satisfies FC
diff --git a/frontend/src/pages/materials/MaterialListPage.tsx b/frontend/src/pages/materials/MaterialListPage.tsx
new file mode 100644
index 0000000..0a0b635
--- /dev/null
+++ b/frontend/src/pages/materials/MaterialListPage.tsx
@@ -0,0 +1,68 @@
+import { Fragment, useEffect, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { Link, useLocation } from 'react-router-dom'
+
+import MaterialSidebar from '@/components/MaterialSidebar'
+import PageTitle from '@/components/common/PageTitle'
+import SectionTitle from '@/components/common/SectionTitle'
+import SubsectionTitle from '@/components/common/SubsectionTitle'
+import MainArea from '@/components/layout/MainArea'
+import { SITE_TITLE } from '@/config'
+import { apiGet } from '@/lib/api'
+
+import type { FC } from 'react'
+
+import type { Tag } from '@/types'
+
+type TagWithMaterial = Omit<Tag, 'children'> & {
+    children: TagWithMaterial[]
+    material: any | null }
+  
+
+
+export default (() => {
+  const [tag, setTag] = useState<TagWithMaterial | null> (null)
+
+  const location = useLocation ()
+  const query = new URLSearchParams (location.search)
+  const tagQuery = query.get ('tag') ?? ''
+
+  useEffect (() => {
+    void (async () => {
+      setTag (
+	  await apiGet<TagWithMaterial> (`/tags/name/${ encodeURIComponent (tagQuery) }/materials`))
+    }) ()
+  }, [location.search])
+
+  return (
+      <div className="md:flex md:flex-1">
+	<Helmet>
+	  <title>{`${ tag ? `${ tag.name } 素材集` : '素材集' } | ${ SITE_TITLE }`}</title>
+	</Helmet>
+
+	<MaterialSidebar/>
+
+	<MainArea>
+	  {tag
+	   ? (
+	      <>
+		<PageTitle>{tag.name}</PageTitle>
+		{tag.children.map (c2 => (
+		    <Fragment key={c2.id}>
+		      <SectionTitle>{c2.name}</SectionTitle>
+		      {c2.children.map (c3 => (
+			  <SubsectionTitle key={c3.id}>{c3.name}</SubsectionTitle>))}
+		    </Fragment>))}
+	      </>)
+	   : (
+	      <>
+		<p>左のリストから照会したいタグを選択してください。</p>
+		<p>もしくは……</p>
+		<ul>
+		  <li><Link to="/materials/new">素材を新規追加する</Link></li>
+		  <li><a href="#">すべての素材をダウンロードする</a></li>
+		</ul>
+	      </>)}
+	</MainArea>
+      </div>)
+}) satisfies FC