diff --git a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
index 1d420c31..52993e3a 100644
--- a/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
+++ b/popcorn/Assets/MyGame/Scenes/CornField/Scripts/CornField.cs
@@ -67,10 +67,10 @@ public class CornField : MonoBehaviour
         // データ
         var gameData = GameDataManager.GameData;
 
-        if (gameData.isFirstPlay)
+        if (!gameData.FinishedFlags.HasFlag(TutorialFlag.CornField))
         {
             promoteGrowthButton.gameObject.SetActive(false);
-            TutorialManager.Instance.ShowTutorialConversation(3, () =>
+            TutorialManager.Instance.ShowTutorialConversation(5, () =>
             {
                 // コーンスワイプ指示
                 cornFieldMask.gameObject.SetActive(true);
@@ -316,7 +316,7 @@ public class CornField : MonoBehaviour
             });
         }
 
-        if (gameData.isFirstPlay)
+        if (!gameData.FinishedFlags.HasFlag(TutorialFlag.CornField))
         {
             // 既に収穫できる状態にする
             var plantLine = gameData.SeedlingDataList.First(data => data.type == PlantLineType.Center);
@@ -335,14 +335,10 @@ public class CornField : MonoBehaviour
                     this.CallWaitForSeconds(4f, () =>
                     {
                         cornFieldMask.gameObject.SetActive(false);
-                        TutorialManager.Instance.ShowTutorialConversation(4, () =>
+                        TutorialManager.Instance.ShowTutorialConversation(6, () =>
                         {
-                            // gameData.SeedlingDataList.Clear();
-                            var go = FindObjectOfType<FooterManager>().transform;
-                            go.transform.FindChildByName("Button_Purchasing", t =>
-                            {
-                                TutorialManager.Instance.ShowTutorialMask(go.parent, t as RectTransform, true);
-                            });
+                            gameData.FinishedFlags |= TutorialFlag.CornField;
+                            GameDataManager.SaveGameData();
                         });
                     });
                 }).AddTo(compositeDisposable);
@@ -426,7 +422,7 @@ public class CornField : MonoBehaviour
                     }
 #endif
                     // チュートリアル時新しい苗を隠す
-                    if (gameData.isFirstPlay)
+                    if (!gameData.FinishedFlags.HasFlag(TutorialFlag.CornField))
                     {
                         seedling.SetSeedlingGene(DateTime.MaxValue, Int32.MaxValue, newGene.Level);
                     }