diff --git a/src/main/java/org/ntlab/acanthus_server/entities/Animation.java b/src/main/java/org/ntlab/acanthus_server/entities/Animation.java
index 42f0cd6..109b7d4 100644
--- a/src/main/java/org/ntlab/acanthus_server/entities/Animation.java
+++ b/src/main/java/org/ntlab/acanthus_server/entities/Animation.java
@@ -12,6 +12,7 @@
 import org.ntlab.acanthus_server.entities.Position;
 import org.ntlab.acanthus_server.entities.Stroke;
 
+import java.lang.reflect.Array;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
@@ -38,7 +39,7 @@
     @JsonProperty("hashTag")
     private ArrayList<String> hashTag = new ArrayList<>();
     @JsonProperty("pageMap")
-    private HashMap<Integer, Page> pageMap = new HashMap<>();
+    private ArrayList<Page> pageMap = new ArrayList<>();
     @JsonIgnore
     private Account owner;
     @JsonIgnore
@@ -62,7 +63,7 @@
         this.isPublic = false;
         this.owner = owner;
         this.editors.add(new Editor(owner, true));
-        this.pageMap.put(0, new Page(1));
+        this.pageMap.add(new Page(0, 1));
         this.lastUpdate = date.format(dateTimeFormatter);
     }
 
@@ -97,10 +98,6 @@
         this.lastUpdate = dt.toString();
     }
 
-    public void setPageMap(int pid, Page page) {
-        this.pageMap.put(pid, page);
-    }
-
     //-----------------------------------------------------------------
     // add
 
@@ -151,8 +148,8 @@
         return lastUpdate;
     }
 
-    public HashMap<Integer, Page> getPageMap() {
-        return pageMap;
+    public ArrayList<Page> getPages() {
+        return this.pageMap;
     }
 
     //-----------------------------------------------------------------
@@ -217,7 +214,7 @@
         this.isPublic = false;
         this.owner = ownerAccount;
         this.editors.add(new Editor(owner, true));
-        this.pageMap.put(0, new Page(1));
+        this.pageMap.add(new Page(0, 1));
 
         LocalDateTime date = LocalDateTime.now();
         DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");