diff --git a/Assets/VRM10_Samples/VRM10Viewer/VRM10Motion.cs b/Assets/VRM10_Samples/VRM10Viewer/VRM10Motion.cs
index d2fef7ba7..b165fd69f 100644
--- a/Assets/VRM10_Samples/VRM10Viewer/VRM10Motion.cs
+++ b/Assets/VRM10_Samples/VRM10Viewer/VRM10Motion.cs
@@ -68,136 +68,5 @@ namespace UniVRM10.VRM10Viewer
                 }
             }
         }
-
-        #region experimental vrm-animation deserializer
-        //
-        // vrm-animation の簡易実装
-        //
-        // https://github.com/vrm-c/vrm-animation
-        //
-        static float ForceMeterScale(Dictionary<HumanBodyBones, Transform> map)
-        {
-            var positionMap = map.ToDictionary(kv => kv.Key, kv => kv.Value.position);
-            var hipsHeight = positionMap[HumanBodyBones.Hips].y;
-
-            float scaling = 1.0f;
-            if (hipsHeight > 80)
-            {
-                // cm スケールであると見做す
-                scaling = 0.01f;
-            }
-            return scaling;
-        }
-
-        static bool TryGet(JsonNode obj, string key, out JsonNode found)
-        {
-            foreach (var kv in obj.ObjectItems())
-            {
-                if (kv.Key.GetString() == key)
-                {
-                    found = kv.Value;
-                    return true;
-                }
-            }
-            found = default;
-            return false;
-        }
-
-        static (HumanBodyBones, int) ToTuple(KeyValuePair<JsonNode, JsonNode> kv)
-        {
-            if (TryGet(kv.Value, "node", out var value))
-            {
-                var name = kv.Key.GetString();
-                switch (name)
-                {
-                    case "rightThumbMetacarpal":
-                        return (HumanBodyBones.RightThumbProximal, value.GetInt32());
-                    case "leftThumbMetacarpal":
-                        return (HumanBodyBones.LeftThumbProximal, value.GetInt32());
-                    case "rightThumbProximal":
-                        return (HumanBodyBones.RightThumbIntermediate, value.GetInt32());
-                    case "leftThumbProximal":
-                        return (HumanBodyBones.LeftThumbIntermediate, value.GetInt32());
-                    default:
-                        return ((HumanBodyBones)Enum.Parse(typeof(HumanBodyBones), name, true), value.GetInt32());
-                }
-            }
-            throw new Exception();
-        }
-
-        static Dictionary<HumanBodyBones, Transform> GetHumanMap(GltfData data, IReadOnlyList<Transform> nodes)
-        {
-            var humanMap = new Dictionary<HumanBodyBones, Transform>();
-            if (data.GLTF.extensions is UniGLTF.glTFExtensionImport extensions)
-            {
-                foreach (var kv in extensions.ObjectItems())
-                {
-                    if (kv.Key.GetString() == "VRMC_vrm_animation")
-                    {
-                        var animation = kv.Value;
-                        if (TryGet(animation, "humanoid", out var animation_humanoid))
-                        {
-                            if (TryGet(animation_humanoid, "humanBones", out var bones))
-                            {
-                                foreach (var kkvv in bones.ObjectItems())
-                                {
-                                    var (bone, index) = ToTuple(kkvv);
-                                    // Debug.Log($"{bone} => {index}");
-                                    humanMap.Add(bone, nodes[index]);
-                                }
-                            }
-                        }
-                    }
-                }
-            }
-            return humanMap;
-        }
-        #endregion
-
-        public static async Task<VRM10Motion> LoadVrmAnimationFromPathAsync(string path)
-        {
-            //
-            // GetHumanoid Mapping
-            //
-            using (GltfData data = new AutoGltfFileParser(path).Parse())
-            using (var loader = new UniGLTF.ImporterContext(data))
-            {
-                loader.InvertAxis = Axes.X;
-                // loader.PositionScaling = 0.01f;
-                var instance = await loader.LoadAsync(new ImmediateCaller());
-                var humanMap = GetHumanMap(data, loader.Nodes);
-                if (humanMap.Count == 0)
-                {
-                    throw new ArgumentException("fail to load VRMC_vrm_animation");
-                }
-
-                var scaling = ForceMeterScale(humanMap);
-                // instance.transform.localScale = new Vector3(scaling, scaling, scaling);
-                var description = AvatarDescription.Create(humanMap);
-
-                //
-                // avatar
-                //
-                var avatar = description.CreateAvatar(instance.Root.transform);
-                avatar.name = "Avatar";
-                // AvatarDescription = description;
-                var animator = instance.gameObject.AddComponent<Animator>();
-                animator.avatar = avatar;
-
-                // create SkinnedMesh for bone visualize
-                var renderer = SkeletonMeshUtility.CreateRenderer(animator);
-                var material = new Material(Shader.Find("Standard"));
-                renderer.sharedMaterial = material;
-                var mesh = renderer.sharedMesh;
-                mesh.name = "box-man";
-
-                var humanoid = instance.gameObject.AddComponent<Humanoid>();
-                humanoid.AssignBonesFromAnimator();
-                var motion = new VRM10Motion(instance);
-                var poseProvider = new InitRotationPoseProvider(instance.transform, humanoid);
-                motion.ControlRig = (poseProvider, poseProvider);
-                return motion;
-            }
-        }
     }
 }