diff --git a/app/models/content.rb b/app/models/content.rb
index b4bb05c..466af71 100644
--- a/app/models/content.rb
+++ b/app/models/content.rb
@@ -3,6 +3,7 @@ class Content < ApplicationRecord
   has_many :user_contents, dependent: :destroy
   has_many :users, through: :user_contents
   has_many :line_flags, dependent: :destroy
+  has_many :line_notifications
   belongs_to :master
 
   enum stream: { default: 0, Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6, Sun: 7 }
@@ -36,4 +37,12 @@ def line_on
   def line_off
     update(line_flag: false)
   end
+
+  def self.total_line_notification
+    all.sum(:line_notifications_count)
+  end
+
+  def self.reset_counter
+    update_all(line_notifications_count: 0)
+  end
 end
diff --git a/app/models/line_notification.rb b/app/models/line_notification.rb
index c5edd65..5b5a183 100644
--- a/app/models/line_notification.rb
+++ b/app/models/line_notification.rb
@@ -1,6 +1,6 @@
 class LineNotification < ApplicationRecord
-  belongs_to :master
-  counter_culture :master
+  belongs_to :content
+  counter_culture :content
 
   scope :monthly_total, -> { where(month: Date.today.month) }
 
@@ -8,7 +8,7 @@ def self.can_notify?
     monthly_total.size < 1000
   end
 
-  def self.create_record(master, month)
-    create(master_id: master.id, month: month)
+  def self.create_record(content, month)
+    create(content_id: content.id, month: month)
   end
 end
diff --git a/db/migrate/20220106041056_create_line_notifications.rb b/db/migrate/20220106041056_create_line_notifications.rb
index 22b21b1..8e902c1 100644
--- a/db/migrate/20220106041056_create_line_notifications.rb
+++ b/db/migrate/20220106041056_create_line_notifications.rb
@@ -1,7 +1,7 @@
 class CreateLineNotifications < ActiveRecord::Migration[5.2]
   def change
     create_table :line_notifications do |t|
-      t.references :master, foreign_key: true
+      t.references :content, foreign_key: true
       t.integer :month, null: false
       t.timestamps
     end
diff --git a/db/migrate/20220107013746_add_line_notifications_count_to_masters.rb b/db/migrate/20220107013746_add_line_notifications_count_to_masters.rb
deleted file mode 100644
index 996405b..0000000
--- a/db/migrate/20220107013746_add_line_notifications_count_to_masters.rb
+++ /dev/null
@@ -1,9 +0,0 @@
-class AddLineNotificationsCountToMasters < ActiveRecord::Migration[5.2]
-  def self.up
-    add_column :masters, :line_notifications_count, :integer, null: false, default: 0
-  end
-
-  def self.down
-    remove_column :masters, :line_notifications_count
-  end
-end
diff --git a/db/migrate/20220125023304_add_content_to_master_colmuns.rb b/db/migrate/20220125023304_add_content_to_master_colmuns.rb
new file mode 100644
index 0000000..a18dff4
--- /dev/null
+++ b/db/migrate/20220125023304_add_content_to_master_colmuns.rb
@@ -0,0 +1,13 @@
+class AddContentToMasterColmuns < ActiveRecord::Migration[5.2]
+  def up
+    add_column :contents, :season, :string
+    add_column :contents, :dummy_episode, :integer, default: 0
+    add_column :contents, :update_day, :string
+  end
+
+  def down
+    remove_column :contents, :season, :string
+    remove_column :contents, :dummy_episode, :integer, default: 0
+    remove_column :contents, :update_day, :string
+  end
+end
diff --git a/db/migrate/20220125025052_add_line_notifications_count_to_contents.rb b/db/migrate/20220125025052_add_line_notifications_count_to_contents.rb
new file mode 100644
index 0000000..da14837
--- /dev/null
+++ b/db/migrate/20220125025052_add_line_notifications_count_to_contents.rb
@@ -0,0 +1,9 @@
+class AddLineNotificationsCountToContents < ActiveRecord::Migration[5.2]
+  def self.up
+    add_column :contents, :line_notifications_count, :integer, null: false, default: 0
+  end
+
+  def self.down
+    remove_column :contents, :line_notifications_count
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 52a0bb9..bde0b30 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_01_18_131731) do
+ActiveRecord::Schema.define(version: 2022_01_25_025052) do
 
   create_table "contents", force: :cascade do |t|
     t.string "title", null: false
@@ -24,6 +24,10 @@
     t.integer "episode", default: 0
     t.boolean "line_flag", default: false, null: false
     t.integer "media", default: 0, null: false
+    t.string "season"
+    t.integer "dummy_episode", default: 0
+    t.string "update_day"
+    t.integer "line_notifications_count", default: 0, null: false
   end
 
   create_table "line_flags", force: :cascade do |t|
@@ -36,11 +40,11 @@
   end
 
   create_table "line_notifications", force: :cascade do |t|
-    t.integer "master_id"
+    t.integer "content_id"
     t.integer "month", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.index ["master_id"], name: "index_line_notifications_on_master_id"
+    t.index ["content_id"], name: "index_line_notifications_on_content_id"
   end
 
   create_table "masters", force: :cascade do |t|
@@ -53,7 +57,6 @@
     t.integer "episode", default: 0
     t.string "season"
     t.string "update_day"
-    t.integer "line_notifications_count", default: 0, null: false
     t.integer "dummy_episode", default: 0
     t.integer "media", default: 0, null: false
   end
diff --git a/lib/tasks/reset_counter.rake b/lib/tasks/reset_counter.rake
index 3be97b7..000a347 100644
--- a/lib/tasks/reset_counter.rake
+++ b/lib/tasks/reset_counter.rake
@@ -3,11 +3,11 @@ namespace :reset_counter do
   task line_notifications: :environment do
     include Day
     if first_day?
-      p "#{last_month}のLINE通知数は#{Master.total_line_notification}件でした"
-      Master.reset_counter
+      p "#{last_month}のLINE通知数は#{Content.total_line_notification}件でした"
+      Content.reset_counter
       p "LINE通知数をリセットしました"
     else
-      p "#{yesterday}時点のLINE通知数は#{Master.total_line_notification}件です"
+      p "#{yesterday}時点のLINE通知数は#{Content.total_line_notification}件です"
     end
   end
 end