diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs
deleted file mode 100644
index 2b7f9e570..000000000
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs
+++ /dev/null
@@ -1,36 +0,0 @@
-using System;
-
-
-namespace UniGLTF
-{
-    /// <summary>
-    /// for glb chunk buffer read
-    /// </summary>
-    public class ArraySegmentByteBuffer
-    {
-        ArraySegment<Byte> m_bytes;
-
-        public ArraySegmentByteBuffer(ArraySegment<Byte> bytes)
-        {
-            m_bytes = bytes;
-        }
-
-        public string Uri
-        {
-            get;
-            private set;
-        }
-
-        public glTFBufferView Extend<T>(ArraySegment<T> array, glBufferTarget target) where T : struct
-        {
-            throw new NotImplementedException();
-        }
-
-        public void ExtendCapacity(int capacity)
-        {
-            throw new NotImplementedException();
-        }
-
-        public ArraySegment<byte> Bytes => m_bytes;
-    }
-}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs.meta
deleted file mode 100644
index 3236a085e..000000000
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/ArraySegmentByteBuffer.cs.meta
+++ /dev/null
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: f857b8b7ca45b1746af90c7fb86b2398
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/Assets/VRM10/Runtime/IO/Vrm10ImportData.cs b/Assets/VRM10/Runtime/IO/Vrm10ImportData.cs
index 32d4bcbce..e85266bea 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10ImportData.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10ImportData.cs
@@ -33,7 +33,7 @@ namespace UniVRM10
 
         public UniGLTF.Extensions.VRMC_springBone.VRMC_springBone gltfVrmSpringBone;
 
-        ArraySegmentByteBuffer _buffer;
+        byte[] _bin;
 
         /// <summary>
         /// for import
@@ -56,7 +56,7 @@ namespace UniVRM10
                 gltfVrmSpringBone = springBone;
             }
 
-            _buffer = new ArraySegmentByteBuffer(new ArraySegment<byte>(data.Bin.ToArray()));
+            _bin = m_data.Bin.ToArray();
         }
 
         public ArraySegment<byte> GetBufferBytes(UniGLTF.glTFBufferView bufferView)
@@ -75,7 +75,7 @@ namespace UniVRM10
             {
                 throw new NotImplementedException();
             }
-            return _buffer.Bytes;
+            return new ArraySegment<byte>(_bin);
         }
 
         static ArraySegment<byte> RestoreSparseAccessorUInt16<T>(ArraySegment<byte> bytes, int accessorCount, ArraySegment<byte> indicesBytes, ArraySegment<byte> valuesBytes)
@@ -137,9 +137,8 @@ namespace UniVRM10
                 if (view.buffer.TryGetValidIndex(Gltf.buffers.Count, out int bufferIndex))
                 {
                     var buffer = m_data.Bin;
-                    var bin = _buffer.Bytes;
                     var byteSize = accessor.CalcByteSize();
-                    bytes = bin.Slice(view.byteOffset, view.byteLength).Slice(accessor.byteOffset, byteSize);
+                    bytes = new ArraySegment<byte>(_bin).Slice(view.byteOffset, view.byteLength).Slice(accessor.byteOffset, byteSize);
                 }
             }