diff --git a/backend/app/models/41454326.32113544.jpg b/backend/app/models/41454326.32113544.jpg
new file mode 100644
index 0000000..4eb8238
Binary files /dev/null and b/backend/app/models/41454326.32113544.jpg differ
diff --git a/backend/app/models/post.rb b/backend/app/models/post.rb
index ecc2f17..f4b77ff 100644
--- a/backend/app/models/post.rb
+++ b/backend/app/models/post.rb
@@ -4,4 +4,12 @@ class Post < ApplicationRecord
   has_many :post_tags, dependent: :destroy
   has_many :tags, through: :post_tags
   has_many :user_post_views, dependent: :destroy
+  has_one_attached :thumbnail
+
+  def as_json options = { }
+    super(options).merge({ thumbnail: thumbnail.attached? ?
+                                      Rails.application.routes.url_helpers.rails_blob_url(
+                                          thumbnail, only_path: false) :
+                                      nil })
+  end
 end
diff --git a/backend/config/environments/production.rb b/backend/config/environments/production.rb
index f49bf44..0bd58c3 100644
--- a/backend/config/environments/production.rb
+++ b/backend/config/environments/production.rb
@@ -85,3 +85,5 @@ Rails.application.configure do
   # Skip DNS rebinding protection for the default health check endpoint.
   # config.host_authorization = { exclude: ->(request) { request.path == "/up" } }
 end
+
+Rails.application.routes.default_url_options[:host] = 'hub.nizika.monster/api'
diff --git a/backend/db/migrate/20250520152153_create_active_storage_tables.active_storage.rb b/backend/db/migrate/20250520152153_create_active_storage_tables.active_storage.rb
new file mode 100644
index 0000000..6bd8bd0
--- /dev/null
+++ b/backend/db/migrate/20250520152153_create_active_storage_tables.active_storage.rb
@@ -0,0 +1,57 @@
+# This migration comes from active_storage (originally 20170806125915)
+class CreateActiveStorageTables < ActiveRecord::Migration[7.0]
+  def change
+    # Use Active Record's configured type for primary and foreign keys
+    primary_key_type, foreign_key_type = primary_and_foreign_key_types
+
+    create_table :active_storage_blobs, id: primary_key_type do |t|
+      t.string   :key,          null: false
+      t.string   :filename,     null: false
+      t.string   :content_type
+      t.text     :metadata
+      t.string   :service_name, null: false
+      t.bigint   :byte_size,    null: false
+      t.string   :checksum
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :key ], unique: true
+    end
+
+    create_table :active_storage_attachments, id: primary_key_type do |t|
+      t.string     :name,     null: false
+      t.references :record,   null: false, polymorphic: true, index: false, type: foreign_key_type
+      t.references :blob,     null: false, type: foreign_key_type
+
+      if connection.supports_datetime_with_precision?
+        t.datetime :created_at, precision: 6, null: false
+      else
+        t.datetime :created_at, null: false
+      end
+
+      t.index [ :record_type, :record_id, :name, :blob_id ], name: :index_active_storage_attachments_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+
+    create_table :active_storage_variant_records, id: primary_key_type do |t|
+      t.belongs_to :blob, null: false, index: false, type: foreign_key_type
+      t.string :variation_digest, null: false
+
+      t.index [ :blob_id, :variation_digest ], name: :index_active_storage_variant_records_uniqueness, unique: true
+      t.foreign_key :active_storage_blobs, column: :blob_id
+    end
+  end
+
+  private
+    def primary_and_foreign_key_types
+      config = Rails.configuration.generators
+      setting = config.options[config.orm][:primary_key_type]
+      primary_key_type = setting || :primary_key
+      foreign_key_type = setting || :bigint
+      [ primary_key_type, foreign_key_type ]
+    end
+end
diff --git a/backend/db/migrate/20250520152740_remove_thumbnail_from_posts.rb b/backend/db/migrate/20250520152740_remove_thumbnail_from_posts.rb
new file mode 100644
index 0000000..abf60f5
--- /dev/null
+++ b/backend/db/migrate/20250520152740_remove_thumbnail_from_posts.rb
@@ -0,0 +1,5 @@
+class RemoveThumbnailFromPosts < ActiveRecord::Migration[8.0]
+  def change
+    remove_column :posts, :thumbnail, :string
+  end
+end
diff --git a/frontend/index.html b/frontend/index.html
index 1bf5475..f1157da 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1,5 +1,5 @@
 <!doctype html>
-<html lang="en">
+<html lang="ja">
   <head>
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/vite.svg" />
diff --git a/frontend/src/pages/HomePage.tsx b/frontend/src/pages/HomePage.tsx
index af5d2a6..4d1c8a0 100644
--- a/frontend/src/pages/HomePage.tsx
+++ b/frontend/src/pages/HomePage.tsx
@@ -21,15 +21,14 @@ const HomePage = () => {
 
   return (
     <div className="flex flex-wrap gap-4 p-4">
-      {posts.map((post) => (
+      {posts.map (post => (
         <Link
           to={`/posts/${post.id}`}
           key={post.id}
           className="w-40 h-40 overflow-hidden rounded-lg shadow-md hover:shadow-lg"
         >
           <img
-            src={post.image_url}
-            alt={post.title}
+            src={post.thumbnail}
             className="object-cover w-full h-full"
           />
         </Link>