diff --git a/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java b/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
index 1d95766..9452ca7 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/FavoriteManager.java
@@ -1,4 +1,6 @@
 package org.ntlab.citrusserver.repositories;
+import org.ntlab.citrusserver.entities.Account;
+import org.ntlab.citrusserver.entities.Book;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Repository;
 
@@ -6,12 +8,15 @@
 import java.util.HashSet;
 
 @Repository
-public class FavoriteManager {
+public class FavoriteManager implements IAccountListener, IBookListener {
     private final AccountManager accountManager;
 
     @Autowired
-    public FavoriteManager(AccountManager accountManager) {
+    public FavoriteManager(AccountManager accountManager, BookManager bookManager) {
         this.accountManager = accountManager;
+        this.accountManager.addListener(this);
+        bookManager.addListener(this);
+
     }
 
     //favorited
@@ -130,6 +135,24 @@
         }
         favoritedMap.get(accountId).remove(bookId);  // tedのbookIdを消したいとき
     }
+
+    @Override
+    public void accountDeleted(Account account) {
+        removeFavoriteById(account.getId());
+    }
+
+
+    @Override
+    public void bookChanged(Account account, Book book) {
+
+    }
+
+    @Override
+    public void bookDeleted(Account account, Book book) {
+        removeFavoriteByBookID(account.getId(), book.getBookId());
+    }
+
+
 }
 
 
diff --git a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
index a2918e0..7421407 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
@@ -1,6 +1,7 @@
 package org.ntlab.citrusserver.repositories;
 
 import org.ntlab.citrusserver.entities.Account;
+import org.ntlab.citrusserver.entities.Book;
 import org.ntlab.citrusserver.entities.Todo;
 import org.springframework.stereotype.Repository;
 
@@ -8,7 +9,7 @@
 
 
 @Repository
-public class TodoManager implements IAccountListener {
+public class TodoManager implements IAccountListener, IBookListener {
 
     /**
      * todoをすべて管理します
@@ -31,6 +32,7 @@
     public TodoManager(AccountManager accountManager, BookManager bookManager) {
         this.bookManager = bookManager;
         accountManager.addListener(this);
+        this.bookManager.addListener(this);
         String[][] accounts = {{"fish", "abc", "def"}, {"bird", "abc", "xyz"}};
         createTodo(accounts[0][0], 1, 2024, 5, 28, "ダミーtodo1");
         createTodo(accounts[1][0], 1, 2024, 5, 28, "ダミーtodo2");
@@ -365,4 +367,13 @@
         deleteAllTodosByAccountId(account.getId());
     }
 
+    @Override
+    public void bookChanged(Account account, Book book) {
+
+    }
+    @Override
+    public void bookDeleted(Account accountIn, Book book) {
+        deleteAllTodosByBookId(accountIn.getId(), book.getBookId());
+    }
+
 }
diff --git a/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java b/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
index df14b1b..e7d5617 100644
--- a/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
+++ b/src/main/java/org/ntlab/citrusserver/resources/AccountsRest.java
@@ -17,12 +17,10 @@
 
 public class AccountsRest {
     private final AccountManager accountManager; //finalは書き換えられない
-    private final FavoriteManager favoriteManager;
 
     @Autowired//springbootの決まり
-    public AccountsRest(AccountManager am,  FavoriteManager favoriteManager) {
+    public AccountsRest(AccountManager am) {
         accountManager = am;
-        this.favoriteManager = favoriteManager;
     }
 
     // アカウントの一覧をリストとして返す(GET)
@@ -72,7 +70,6 @@
                                @QueryParam("password")String password) {
         if(accountManager.checkToken(accountId, token)) {
             accountManager.deleteAccount(accountId, token, password);
-            favoriteManager.removeFavoriteById(accountId);
             return;
         }
         //404
diff --git a/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java b/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
index 2fd6a5c..7ac6f4a 100644
--- a/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
+++ b/src/main/java/org/ntlab/citrusserver/resources/BooksRest.java
@@ -22,15 +22,11 @@
 
     private final BookManager bookManager;
     private final AccountManager accountManager;
-    private final TodoManager todoManager;
-    private final FavoriteManager favoriteManager;
     @Autowired  // スプリングブートにいうサイン
-    public BooksRest(BookManager bm, AccountManager ac, TodoManager tm, FavoriteManager fm){//public クラス名（）がコンストラクタ
+    public BooksRest(BookManager bm, AccountManager ac){//public クラス名（）がコンストラクタ
 
         bookManager = bm;
         accountManager = ac;
-        todoManager = tm;
-        favoriteManager = fm;
     }
 
 
@@ -81,8 +77,6 @@
 
         accountCheck(account_id);
         tokenCheck(account_id, token);
-        todoManager.deleteAllTodosByBookId(account_id, book_id);//削除時、Todoも消す
-        favoriteManager.removeFavoriteByBookID(account_id, book_id);//削除時、Favoriteも消す
         bookManager.deleteBook(account_id, book_id);
         return "success";
     }