diff --git a/src/main/java/org/ntlab/acanthus_server/resources/gallery/LayersRest.java b/src/main/java/org/ntlab/acanthus_server/resources/gallery/LayersRest.java
index 88b550c..e0a00e8 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/gallery/LayersRest.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/gallery/LayersRest.java
@@ -1,7 +1,9 @@
 package org.ntlab.acanthus_server.resources.gallery;
 
 import org.ntlab.acanthus_server.entities.Layer;
+import org.ntlab.acanthus_server.entities.Page;
 import org.ntlab.acanthus_server.entities.Position;
+import org.ntlab.acanthus_server.entities.Stroke;
 import org.ntlab.acanthus_server.models.Gallery;
 import org.springframework.stereotype.Component;
 
@@ -27,7 +29,12 @@
     @Produces(MediaType.APPLICATION_JSON)
     public Integer getLayers(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        return pages.get(pid).getLayers().size();
+        for (var p : pages) {
+            if (!p.getPid().equals(pid)) continue;
+            return p.getLayers().size();
+        }
+
+        throw new WebApplicationException(404);
     }
 
 
@@ -40,13 +47,17 @@
     @POST
     @Produces(MediaType.APPLICATION_JSON)
     public Integer addLayer(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid) {
+        var layerSize = 4;
         var pages = gallery.getAnimationByAid(aid).getPages();
+        var page = (Page) null;
 
-        if (pages.get(pid).getLayers().size() < 4) {
-            pages.get(pid).getLayers().add(new Layer());
+        for (var p : pages) {
+            if (!p.getPid().equals(pid)) continue;
+            page = p;
+            if (p.getLayers().size() < layerSize) p.getLayers().add(new Layer());
         }
 
-        return pages.get(pid).getLayers().size();
+        return page.getLayers().size();
     }
 
 
@@ -61,7 +72,11 @@
     @Produces(MediaType.APPLICATION_JSON)
     public Integer getStrokeNo(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid, @PathParam("layerNo") Integer layerNo) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
+        var strokes = new ArrayList<Stroke>();
+        for (var p : pages) {
+            if (pid.equals(p.getPid()))
+                strokes = p.getLayers().get(layerNo).getStrokes();
+        }
 
         if (strokes == null) return null;
         return (strokes.size() - 1);
diff --git a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
index f27d813..0a66e85 100644
--- a/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
+++ b/src/main/java/org/ntlab/acanthus_server/resources/gallery/StrokesRest.java
@@ -29,7 +29,12 @@
     @Produces(MediaType.APPLICATION_JSON)
     public ArrayList<Stroke> getStrokes(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid, @PathParam("layerNo") Integer layerNo) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        return pages.get(pid).getLayers().get(layerNo).getStrokes();
+
+        for (var p : pages) {
+            if (pid.equals(p.getPid())) return p.getLayers().get(layerNo).getStrokes();
+        }
+
+        throw new WebApplicationException(404);
     }
 
     // _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
@@ -51,17 +56,16 @@
                               @FormParam("uid") Integer uid, @FormParam("uidToken") String uidToken, @FormParam("pen") Integer pen,
                               @FormParam("color") Integer color, @FormParam("thick") Integer thick) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
+        var strokes = new ArrayList<Stroke>();
 
-        Stroke stroke = new Stroke();
+        for (var p : pages) {
+            if (pid.equals(p.getPid())) strokes = p.getLayers().get(layerNo).getStrokes();
+        }
+
+        var stroke = new Stroke();
         stroke.addStrokes(pen, color, thick); // 線の情報を追加
         strokes.add(stroke);
-        stroke.setStrokeNo(strokes.size()-1);   // strokeNoに現在のstrokesのsizeを入れる
-//        if(animation != null) {
-//            this.Test.setStrokes(pen, color, thick);
-//        }else{
-//            throw new WebApplicationException(401);
-//        }
+        stroke.setStrokeNo(strokes.size() - 1);   // strokeNoに現在のstrokesのsizeを入れる
 
         return stroke.getStrokeNo();
     }
@@ -85,7 +89,10 @@
     @Produces(MediaType.APPLICATION_JSON)
     public String deleteStrokes(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid, @PathParam("layerNo") Integer layerNo, @QueryParam("uid") Integer uid) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
+        var strokes = new ArrayList<Stroke>();
+        for (var page : pages) {
+            if (pid.equals(page.getPid())) strokes = page.getLayers().get(layerNo).getStrokes();
+        }
 
         strokes.clear();
         return "LGTM?";
@@ -108,9 +115,13 @@
     @DELETE
     @Produces(MediaType.APPLICATION_JSON)
     public String deleteStrokeByStrokeNo(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid,
-                                 @PathParam("layerNo") Integer layerNo, @PathParam("strokeNo") Integer strokeNo) {
+                                         @PathParam("layerNo") Integer layerNo, @PathParam("strokeNo") Integer strokeNo) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
+        var strokes = new ArrayList<Stroke>();
+        for (var page : pages) {
+            if (pid.equals(page.getPid())) strokes = page.getLayers().get(layerNo).getStrokes();
+        }
+
 
         strokes.remove((int) strokeNo);
         return "やかんの麦茶";
@@ -134,7 +145,11 @@
     public SortedSet<Position> getPositions(@PathParam("aid") Integer aid, @PathParam("pid") Integer pid,
                                             @PathParam("layerNo") Integer layerNo, @PathParam("strokeNo") Integer strokeNo) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
+        var strokes = new ArrayList<Stroke>();
+        for (var p : pages) {
+            if (pid.equals(p.getPid())) strokes = p.getLayers().get(layerNo).getStrokes();
+        }
+
 
 /*        Collections.sort(strokes.get(strokeNo).getPositions(), new Comparator() {
 
@@ -165,12 +180,16 @@
     @POST
     @Produces(MediaType.APPLICATION_JSON)
     public Integer addPosition(@FormParam("positionNo") Integer positionNo, @PathParam("aid") Integer aid, @PathParam("pid") Integer pid, @PathParam("strokeNo") Integer strokeNo,
-                                @PathParam("layerNo") Integer layerNo, @FormParam("x") Float x, @FormParam("y") Float y) {
+                               @PathParam("layerNo") Integer layerNo, @FormParam("x") Float x, @FormParam("y") Float y) {
         var pages = gallery.getAnimationByAid(aid).getPages();
-        var strokes = pages.get(pid).getLayers().get(layerNo).getStrokes();
 
+        var strokes = new ArrayList<Stroke>();
+        for (var p : pages) {
+            if (pid.equals(p.getPid()))
+                strokes = p.getLayers().get(layerNo).getStrokes();
+        }
 
-        Position position = new Position();
+        var position = new Position();
         position.setXY(positionNo, x, y);
         strokes.get(strokeNo).addPosition(position);          // 呼び出したstrokesに座標を追加する
 //        if(animation != null) {