diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs
new file mode 100644
index 000000000..4d4d65774
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs
@@ -0,0 +1,24 @@
+using System;
+
+namespace UniGLTF
+{
+    /// <summary>
+    /// Represents bytes access by URL in gltf
+    /// </summary>
+    public interface IStorage
+    {
+        /// <summary>
+        /// gltf の buffer の バイト列アクセス を実装する。
+        /// 1. url による相対パス
+        /// 2. url によるbase64 encoding
+        /// 3. url がnullのときに bin chunk(buffers[0]) にアクセスする
+        /// 
+        /// TODO:
+        /// 1. url による相対パス
+        /// 以外をやめて、呼び出し側で分岐させる。
+        /// </summary>
+        /// <param name="url"></param>
+        /// <returns></returns>
+        ArraySegment<Byte> Get(string url = default);
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs.meta
similarity index 83%
rename from Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs.meta
rename to Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs.meta
index f416db4ca..f70761485 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs.meta
+++ b/Assets/UniGLTF/Runtime/UniGLTF/Format/IStorage.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: aed87db763d65564e96f23fc8bebd382
+guid: f87f7ed809642e0429061fd5f6c169f3
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs
deleted file mode 100644
index e1052d157..000000000
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/IUrlGetter.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-using System;
-
-namespace UniGLTF
-{
-    public interface IUrlGetter
-    {
-        ArraySegment<Byte> Get(string url = default);
-    }
-}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFBuffer.cs b/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFBuffer.cs
index 8f5ffe939..ed5dbb166 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFBuffer.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/Format/glTFBuffer.cs
@@ -9,9 +9,9 @@ namespace UniGLTF
         IBytesBuffer m_buffer;
         public IBytesBuffer Buffer => m_buffer;
 
-        public void OpenStorage(IUrlGetter urlGetter)
+        public void OpenStorage(IStorage storage)
         {
-            m_buffer = new ArraySegmentByteBuffer(urlGetter.Get(uri));
+            m_buffer = new ArraySegmentByteBuffer(storage.Get(uri));
         }
 
         public glTFBuffer()
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/FileSystemStorage.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/FileSystemStorage.cs
index 5712f4c95..2ffb85872 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/FileSystemStorage.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/FileSystemStorage.cs
@@ -4,7 +4,10 @@ using System.IO;
 
 namespace UniGLTF
 {
-    public class SimpleStorage : IUrlGetter
+    /// <summary>
+    /// Implement bin chunk access
+    /// </summary>
+    public class SimpleStorage : IStorage
     {
         ArraySegment<Byte> m_bytes;
 
@@ -28,7 +31,10 @@ namespace UniGLTF
         }
     }
 
-    public class FileSystemStorage : IUrlGetter
+    /// <summary>
+    /// Implement url that represnet relative path
+    /// </summary>
+    public class FileSystemStorage : IStorage
     {
         string m_root;
 
@@ -60,7 +66,10 @@ namespace UniGLTF
         }
     }
 
-    public class GltfStorage : IUrlGetter
+    /// <summary>
+    /// for UnitTest
+    /// </summary>
+    public class GltfStorage : IStorage
     {
         glTF _gltf;
 
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
index 8c1092edc..068530dc3 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
@@ -47,40 +47,40 @@ namespace UniGLTF
         /// <summary>
         /// URI access
         /// </summary>
-        IUrlGetter _urlGetter;
+        public IStorage _storage;
 
         /// <summary>
         /// Migration Flags used by ImporterContext
         /// </summary>
         public MigrationFlags MigrationFlags { get; }
 
-        public GltfData(string targetPath, string json, glTF gltf, IReadOnlyList<GlbChunk> chunks, IUrlGetter urlGetter, MigrationFlags migrationFlags)
+        public GltfData(string targetPath, string json, glTF gltf, IReadOnlyList<GlbChunk> chunks, IStorage storage, MigrationFlags migrationFlags)
         {
             TargetPath = targetPath;
             Json = json;
             GLTF = gltf;
             Chunks = chunks;
-            _urlGetter = urlGetter;
+            _storage = storage;
             MigrationFlags = migrationFlags;
         }
 
         public static GltfData CreateFromGltfDataForTest(glTF gltf, ArraySegment<byte> bytes = default)
         {
-            IUrlGetter urlGetter = null;
+            IStorage storage = null;
             if (bytes.Array != null)
             {
-                urlGetter = new SimpleStorage(bytes);
+                storage = new SimpleStorage(bytes);
             }
             else
             {
-                urlGetter = new GltfStorage(gltf);
+                storage = new GltfStorage(gltf);
             }
             return new GltfData(
                 string.Empty,
                 string.Empty,
                 gltf,
                 new List<GlbChunk>(),
-                urlGetter,
+                storage,
                 new MigrationFlags()
             );
         }
@@ -90,7 +90,7 @@ namespace UniGLTF
         {
             // TODO:
             var buffer = GLTF.buffers[bufferIndex];
-            return _urlGetter.Get(buffer.uri);
+            return _storage.Get(buffer.uri);
         }
 
         public ArraySegment<Byte> GetViewBytes(int bufferView)
@@ -263,7 +263,7 @@ namespace UniGLTF
             }
             else
             {
-                return _urlGetter.Get(image.uri);
+                return _storage.Get(image.uri);
             }
         }
 
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/GlbLowLevelParser.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/GlbLowLevelParser.cs
index 8c206e782..a0ecdfd51 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/GlbLowLevelParser.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/GlbLowLevelParser.cs
@@ -71,7 +71,7 @@ namespace UniGLTF
             return chunks;
         }
 
-        public static GltfData ParseGltf(string path, string json, IReadOnlyList<GlbChunk> chunks, IUrlGetter urlGetter, MigrationFlags migrationFlags)
+        public static GltfData ParseGltf(string path, string json, IReadOnlyList<GlbChunk> chunks, IStorage storage, MigrationFlags migrationFlags)
         {
             var GLTF = GltfDeserializer.Deserialize(json.ParseAsJson());
             if (GLTF.asset.version != "2.0")
@@ -96,10 +96,10 @@ namespace UniGLTF
             //GLTF.baseDir = System.IO.Path.GetDirectoryName(Path);
             foreach (var buffer in GLTF.buffers)
             {
-                buffer.OpenStorage(urlGetter);
+                buffer.OpenStorage(storage);
             }
 
-            return new GltfData(path, json, GLTF, chunks, urlGetter, migrationFlags);
+            return new GltfData(path, json, GLTF, chunks, storage, migrationFlags);
         }
 
         private static void FixMeshNameUnique(glTF GLTF)
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/JsonWithStorageParser.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/JsonWithStorageParser.cs
index c04d8f2f4..5037dd55b 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/JsonWithStorageParser.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/Parser/JsonWithStorageParser.cs
@@ -10,12 +10,12 @@ namespace UniGLTF
     public sealed class JsonWithStorageParser
     {
         private readonly string _json;
-        private readonly IUrlGetter _storage;
+        private readonly IStorage _storage;
 
-        public JsonWithStorageParser(string json, IUrlGetter urlGetter = null)
+        public JsonWithStorageParser(string json, IStorage storage = null)
         {
             _json = json;
-            _storage = urlGetter ?? new SimpleStorage(new ArraySegment<byte>());
+            _storage = storage ?? new SimpleStorage(new ArraySegment<byte>());
         }
 
         public GltfData Parse()
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/ZipArchiveStorage.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/ZipArchiveStorage.cs
index fe284e16e..eaee1d74c 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/ZipArchiveStorage.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/ZipArchiveStorage.cs
@@ -292,7 +292,10 @@ namespace UniGLTF.Zip
         }
     }
 
-    class ZipArchiveStorage : IUrlGetter
+    /// <summary>
+    /// Implement url that reference zip archive
+    /// </summary>
+    class ZipArchiveStorage : IStorage
     {
         public override string ToString()
         {