diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
index cce35b7bb..f76e12bd5 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GlbScriptedImporter.cs
@@ -13,17 +13,11 @@ namespace UniGLTF
     public class GlbScriptedImporter : ScriptedImporter
     {
         [SerializeField]
-        Axes m_reverseAxis;
+        ScriptedImporterAxes m_reverseAxis;
 
         public override void OnImportAsset(AssetImportContext ctx)
         {
-            var asset = AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(ctx.assetPath);
-            if (asset == null)
-            {
-                // first time. set default setting
-                m_reverseAxis = UniGLTFPreference.GltfIOAxis;
-            }
-            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis);
+            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis.ToAxes());
         }
     }
 }
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
index ef417474e..6a079cda2 100644
--- a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/GltfScriptedImporter.cs
@@ -13,17 +13,11 @@ namespace UniGLTF
     public class GltfScriptedImporter : ScriptedImporter
     {
         [SerializeField]
-        Axes m_reverseAxis = default;
+        ScriptedImporterAxes m_reverseAxis = default;
 
         public override void OnImportAsset(AssetImportContext ctx)
         {
-            var asset = AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(ctx.assetPath);
-            if (asset == null)
-            {
-                // first time. set default setting
-                m_reverseAxis = UniGLTFPreference.GltfIOAxis;
-            }
-            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis);
+            ScriptedImporterImpl.Import(this, ctx, m_reverseAxis.ToAxes());
         }
     }
 }
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs
new file mode 100644
index 000000000..42e41c13f
--- /dev/null
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs
@@ -0,0 +1,34 @@
+namespace UniGLTF
+{
+    /// <summary>
+    /// ScriptedImporter の Inspector 用の Axes 設定
+    /// </summary>
+    public enum ScriptedImporterAxes
+    {
+        Default,
+        Z,
+        X,
+    }
+
+    public static class ScriptedImporterAxesExtensions
+    {
+        public static Axes ToAxes(this ScriptedImporterAxes axis)
+        {
+            switch (axis)
+            {
+                case ScriptedImporterAxes.Z: return Axes.Z;
+                case ScriptedImporterAxes.X: return Axes.X;
+                case ScriptedImporterAxes.Default:
+                    {
+#if UNIGLTF_DEFAULT_AXES_X
+                        return Axes.X;
+#else
+                        return Axes.Z;
+#endif
+                    }
+
+                default: throw new System.NotImplementedException();
+            }
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs.meta b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs.meta
new file mode 100644
index 000000000..9891067a1
--- /dev/null
+++ b/Assets/UniGLTF/Editor/UniGLTF/ScriptedImporter/ScriptedImporterAxes.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 6f9b903cff6f27c4dbee54a9b8e8d1af
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/Axes.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/Axes.cs
index 3b382442e..1466fd932 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/Axes.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/Axes.cs
@@ -5,7 +5,6 @@ namespace UniGLTF
 {
     public enum Axes
     {
-        Default,
         Z,
         X,
     }
@@ -68,15 +67,6 @@ namespace UniGLTF
     {
         public static IAxisInverter Create(this Axes axis)
         {
-            if (axis == Axes.Default)
-            {
-#if UNIGLTF_DEFAULT_AXES_X
-                axis = Axes.X;
-#else
-                axis = Axes.Z;
-#endif
-            }
-
             switch (axis)
             {
                 case Axes.Z: return new ReverseZ();