diff --git a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
index a2bcb74..261e17e 100644
--- a/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
+++ b/app/src/main/java/org/ntlab/acanthus_client/Acanthus.java
@@ -25,6 +25,7 @@
     private Integer aid;
     private Integer editingPageNo = 1;
     private Integer editingPageId = 0;
+    private Integer prePageId = 0;
     private Animation currentAnimation;
     private Collection<AnimationJson> animationJsonList = new ArrayList<>();
 
@@ -87,6 +88,10 @@
         return this.editingPageId;
     }
 
+    public Integer getPrePageId() {
+        return this.prePageId;
+    }
+
     public Animation getCurrentAnimation() {
         return currentAnimation;
     }
@@ -152,6 +157,10 @@
         this.editingPageId = editingPageId;
     }
 
+    public void setPrePageId(Integer prePageId) {
+        this.prePageId = prePageId;
+    }
+
     //HomeViewModelでしようするためのsetter
     public void setAnimationJsonList(Collection<AnimationJson> sentAnimationJsonList) {
         this.animationJsonList.clear();