diff --git a/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterImpl.cs b/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterImpl.cs
index ed03b3ac2..4aa87e7f3 100644
--- a/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterImpl.cs
+++ b/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterImpl.cs
@@ -94,7 +94,7 @@ namespace UniVRM10
             //
             // Import(create unity objects)
             //
-            var externalObjectMap = scriptedImporter.GetExternalObjectMap().Select(kv => (kv.Value.name, kv.Value)).ToArray();
+            var externalObjectMap = scriptedImporter.GetExternalObjectMap().ToDictionary(kv => new SubAssetKey(kv.Key.type, kv.Key.name), kv => kv.Value);
 
             using (var loader = new RuntimeUnityBuilder(parser, externalObjectMap))
             {
diff --git a/Assets/VRM10/Runtime/IO/RuntimeUnityBuilder.cs b/Assets/VRM10/Runtime/IO/RuntimeUnityBuilder.cs
index e0d7b516a..0fc7406cf 100644
--- a/Assets/VRM10/Runtime/IO/RuntimeUnityBuilder.cs
+++ b/Assets/VRM10/Runtime/IO/RuntimeUnityBuilder.cs
@@ -18,8 +18,12 @@ namespace UniVRM10
 
         UniGLTF.Extensions.VRMC_vrm.VRMC_vrm m_vrm;
 
-        public RuntimeUnityBuilder(UniGLTF.GltfParser parser, IEnumerable<(string, UnityEngine.Object)> externalObjectMap = null) : base(parser, externalObjectMap)
+        IDictionary<SubAssetKey, UnityEngine.Object> m_externalMap;
+
+        public RuntimeUnityBuilder(UniGLTF.GltfParser parser, IDictionary<SubAssetKey, UnityEngine.Object> externalObjectMap = null)
+        : base(parser, externalObjectMap.Select(kv => (kv.Key.Name, kv.Value)))
         {
+            m_externalMap = externalObjectMap;
             m_model = VrmLoader.CreateVrmModel(parser);
 
             // for `VRMC_materials_mtoon`
@@ -241,7 +245,11 @@ namespace UniVRM10
         async Task LoadVrmAsync(IAwaitCaller awaitCaller, VRM10Controller controller, UniGLTF.Extensions.VRMC_vrm.VRMC_vrm vrm)
         {
             // meta
-            if (vrm.Meta != null)
+            if (m_externalMap.TryGetValue(VRM10MetaObject.SubAssetKey, out UnityEngine.Object meta))
+            {
+                controller.Meta.Meta = meta as VRM10MetaObject;
+            }
+            else if (vrm.Meta != null)
             {
                 var src = vrm.Meta;
                 m_meta = ScriptableObject.CreateInstance<VRM10MetaObject>();
@@ -281,7 +289,11 @@ namespace UniVRM10
             }
 
             // expression
-            if (vrm.Expressions != null)
+            if (m_externalMap.TryGetValue(VRM10ExpressionAvatar.SubAssetKey, out UnityEngine.Object expressionAvatar))
+            {
+                controller.Expression.ExpressionAvatar = expressionAvatar as VRM10ExpressionAvatar;
+            }
+            else if (vrm.Expressions != null)
             {
                 controller.Expression.ExpressionAvatar = ScriptableObject.CreateInstance<VRM10ExpressionAvatar>();
 
@@ -573,9 +585,12 @@ namespace UniVRM10
                 m_humanoid = null;
             }
 
-            if (take(m_meta))
+            if (m_meta != null)
             {
-                m_meta = null;
+                if (take(m_meta))
+                {
+                    m_meta = null;
+                }
             }
 
             if (m_exressionAvatar != null && m_exressionAvatar.Clips != null)