diff --git a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
index cd40e22..4595917 100644
--- a/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
+++ b/src/main/java/org/ntlab/citrusserver/repositories/TodoManager.java
@@ -338,6 +338,33 @@
         return 1;
     }
 
+    public int setTodo(String accountId, int bookId, int year, int month, int day, int todoId, String title){
+        if(!todos.containsKey(accountId)){
+            return -1;
+        }
+        if(!todos.get(accountId).containsKey(bookId)){
+            return -1;
+        }
+        if(!todos.get(accountId).get(bookId).containsKey(year)){
+            return -1;
+        }
+        if(!todos.get(accountId).get(bookId).get(year).containsKey(month)){
+            return -1;
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).containsKey(day)){
+            return -1;
+        }
+        if(!todos.get(accountId).get(bookId).get(year).get(month).get(day).containsKey(todoId)){
+            return -1;
+        }
+        todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setTitle(title);
+        todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setBookId(bookId);
+        todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setYear(year);
+        todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setMonth(month);
+        todos.get(accountId).get(bookId).get(year).get(month).get(day).get(todoId).setDay(day);
+        return 1;
+    }
+
     /**
      *todo_idを指定してtodoの達成状態を変更
      *