diff --git a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
index 5ee3fc67e..c8cacae73 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Instance/Vrm10Instance.cs
@@ -139,7 +139,18 @@ namespace UniVRM10
             {
                 // importer 内で InitializeAsync が呼び出し済み
             }
-            return new Vrm10Runtime(this, useControlRig, m_springBoneRuntime);
+
+            var runtime = GetComponent<RuntimeGltfInstance>();
+
+            // Vrm10Runtimeが使う初期姿勢を固定する。SpringBone や Constraint の初期姿勢になる。
+            var initPose = runtime != null
+            // RuntimeGltfInstance があるとき => RuntimeLoad => 初期姿勢は glTF の node に由来する
+            ? runtime.InitialTransformStates.ToDictionary((kv) => kv.Key, (kv) => kv.Value)
+            // RuntimeGltfInstance が無いとき => Scene 配置の prefab など。シーンの現状を代用する。既に T-Pose でないかもしれない。
+            : GetComponentsInChildren<Transform>().ToDictionary(x => x, x => new TransformState(x))
+            ;
+
+            return new Vrm10Runtime(this, useControlRig, m_springBoneRuntime, initPose);
         }
 
         public Vrm10Runtime Runtime
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10Runtime.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10Runtime.cs
index 3d628b13d..c6e8661e2 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10Runtime.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10Runtime.cs
@@ -49,25 +49,21 @@ namespace UniVRM10
             }
         }
 
-        Dictionary<Transform, TransformState> _initPose;
+        IReadOnlyDictionary<Transform, TransformState> _initPose;
 
-        public Vrm10Runtime(Vrm10Instance instance, bool useControlRig, IVrm10SpringBoneRuntime springBoneRuntime)
+        public Vrm10Runtime(Vrm10Instance instance, bool useControlRig, IVrm10SpringBoneRuntime springBoneRuntime,
+            IReadOnlyDictionary<Transform, TransformState> initPose)
         {
             if (!Application.isPlaying)
             {
                 UniGLTFLogger.Warning($"{nameof(Vrm10Runtime)} expects runtime behaviour.");
             }
-            if (instance == null)
-            {
-                m_instance = null;
-                return;
-            }
 
-            if (m_instance != instance)
+            _initPose = initPose;
+            m_instance = instance;
+            if (m_instance == null)
             {
-                m_instance = instance;
-                var runtime = m_instance.GetComponent<RuntimeGltfInstance>();
-                _initPose = runtime.InitialTransformStates.ToDictionary((kv) => kv.Key, (kv) => kv.Value);
+                return;
             }
 
             if (!instance.TryGetBoneTransform(HumanBodyBones.Head, out m_head))