diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index dd90a264af..005719eefc 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -119,27 +119,26 @@ internal Vrm10Runtime MakeRuntime(bool useControlRig)
         {
             if (m_springBoneRuntime == null)
             {
-                // シーン配置モデルが play された
+                // springbone が無い => シーン配置モデルが play されたと見做す
                 var provider = GetComponent<IVrm10SpringBoneRuntimeProvider>();
                 if (provider != null)
                 {
                     // 明示的カスタマイズ
                     m_springBoneRuntime = provider.CreateSpringBoneRuntime();
                 }
-                else
+
+                if (m_springBoneRuntime == null)
                 {
-                    // deafult に fallback
-                    if (Application.isEditor)
-                    {
-                        m_springBoneRuntime = new Vrm10FastSpringboneRuntimeStandalone();
-                    }
-                    else
-                    {
-                        m_springBoneRuntime = new Vrm10FastSpringboneRuntime();
-                    }
+                    // シーン配置 play のデフォルトは singletone ではない方
+                    m_springBoneRuntime = new Vrm10FastSpringboneRuntimeStandalone();
                 }
+
                 m_springBoneRuntime.InitializeAsync(this, new ImmediateCaller());
             }
+            else
+            {
+                // importer 内で InitializeAsync が呼び出し済み
+            }
             return new Vrm10Runtime(this, useControlRig, m_springBoneRuntime);
         }
 
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
index c3c05ff387..3e920d2bd5 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Importer.cs
@@ -54,24 +54,27 @@ public Vrm10Importer(
                 m_externalMap = new Dictionary<SubAssetKey, UnityEngine.Object>();
             }
 
-            m_springboneRuntime = MakeDefaultRuntime(springboneRuntime, isAssetImport);
-        }
-
-        static IVrm10SpringBoneRuntime MakeDefaultRuntime(IVrm10SpringBoneRuntime runtime, bool isAssetImport)
-        {
-            if (runtime != null)
+            if (springboneRuntime == null)
             {
-                return runtime;
-            }
-
-            if (isAssetImport)
-            {
-                // 何もしない dummy
-                return new Vrm10NopSpringboneRuntime();
+                if (isAssetImport)
+                {
+                    // 何もしない dummy
+                    springboneRuntime = new Vrm10NopSpringboneRuntime();
+                }
+                else
+                {
+                    if (!Application.isPlaying)
+                    {
+                        // play中でない。test 対策
+                        springboneRuntime = new Vrm10FastSpringboneRuntimeStandalone();
+                    }
+                    else
+                    {
+                        springboneRuntime = new Vrm10FastSpringboneRuntime();
+                    }
+                }
             }
-
-            // Vrm10Instance.MakeRuntime に移譲
-            return null;
+            m_springboneRuntime = springboneRuntime;
         }
 
         static void AssignHumanoid(List<VrmLib.Node> nodes, UniGLTF.Extensions.VRMC_vrm.HumanBone humanBone, VrmLib.HumanoidBones key)