diff --git a/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneBufferCombiner.cs b/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneBufferCombiner.cs
index a1c46b747..efd342140 100644
--- a/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneBufferCombiner.cs
+++ b/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneBufferCombiner.cs
@@ -32,21 +32,7 @@ namespace UniGLTF.SpringBoneJobs
 
         public bool HasBuffer => _buffers.Count > 0 && _combinedBuffer != null;
 
-        public void Register(FastSpringBoneBuffer buffer)
-        {
-            _request.Enqueue(new Request { Add = buffer });
-        }
-
-        public void Unregister(FastSpringBoneBuffer buffer)
-        {
-            _request.Enqueue(new Request { Remove = buffer });
-        }
-
-        /// <summary>
-        /// 順番が変わらないように更新する
-        /// </summary>
-        /// <param name="buffer"></param>
-        public void ReRegister(FastSpringBoneBuffer remove, FastSpringBoneBuffer add)
+        public void Register(FastSpringBoneBuffer add, FastSpringBoneBuffer remove)
         {
             _request.Enqueue(new Request { Remove = remove, Add = add });
         }
diff --git a/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneConbinedBuffer.cs b/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneConbinedBuffer.cs
index 6a64725b0..3202abfbd 100644
--- a/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneConbinedBuffer.cs
+++ b/Assets/UniGLTF/Runtime/SpringBoneJobs/FastSpringBoneConbinedBuffer.cs
@@ -79,7 +79,7 @@ namespace UniGLTF.SpringBoneJobs
         }
 
         /// <summary>
-        /// Lidt<FastSpringBoneBuffer> をひとつの FastSpringBoneCombinedBuffer に統合する
+        /// Job向けに、Lidt[FastSpringBoneBuffer] をひとつの FastSpringBoneCombinedBuffer に統合する
         /// </summary>
         internal static JobHandle Create(JobHandle handle,
             IReadOnlyList<FastSpringBoneBuffer> buffers, out FastSpringBoneCombinedBuffer combined)
diff --git a/Assets/VRM/Runtime/SpringBone/Jobs/Vrm0XFastSpringBoneRuntime.cs b/Assets/VRM/Runtime/SpringBone/Jobs/Vrm0XFastSpringBoneRuntime.cs
index 4e730e4ac..45d56ffad 100644
--- a/Assets/VRM/Runtime/SpringBone/Jobs/Vrm0XFastSpringBoneRuntime.cs
+++ b/Assets/VRM/Runtime/SpringBone/Jobs/Vrm0XFastSpringBoneRuntime.cs
@@ -57,7 +57,7 @@ namespace VRM
                 return;
             }
 
-            m_service.BufferCombiner.Unregister(m_buffer);
+            m_service.BufferCombiner.Register(add: null, remove: m_buffer);
             m_buffer.Dispose();
             m_buffer = null;
         }
@@ -67,7 +67,7 @@ namespace VRM
             Debug.Assert(m_buffer == null);
             var buffer = await SpringBoneJobs.FastSpringBoneReplacer.MakeBufferAsync(m_vrm, awaitCaller);
             m_buffer = buffer;
-            SpringBoneJobs.FastSpringBoneService.Instance.BufferCombiner.Register(buffer);
+            SpringBoneJobs.FastSpringBoneService.Instance.BufferCombiner.Register(add: buffer, remove: null);
 
         }
 
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
index 4f26d93d1..246eb9c7c 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntime.cs
@@ -55,7 +55,7 @@ namespace UniVRM10
         {
             if (m_fastSpringBoneBuffer != null)
             {
-                m_fastSpringBoneService.BufferCombiner.Unregister(m_fastSpringBoneBuffer);
+                m_fastSpringBoneService.BufferCombiner.Register(add: null, remove: m_fastSpringBoneBuffer);
                 m_fastSpringBoneBuffer.Dispose();
             }
         }
@@ -87,16 +87,10 @@ namespace UniVRM10
             }
             m_building = true;
 
-            // 登録削除
-            if (m_fastSpringBoneBuffer != null)
-            {
-                m_fastSpringBoneService.BufferCombiner.Unregister(m_fastSpringBoneBuffer);
-            }
+            var fastSpringBoneBuffer = await FastSpringBoneBufferFactory.ConstructSpringBoneAsync(awaitCaller, m_instance, m_fastSpringBoneBuffer);
 
-            m_fastSpringBoneBuffer = await FastSpringBoneBufferFactory.ConstructSpringBoneAsync(awaitCaller, m_instance, m_fastSpringBoneBuffer);
-
-            // 登録
-            m_fastSpringBoneService.BufferCombiner.Register(m_fastSpringBoneBuffer);
+            m_fastSpringBoneService.BufferCombiner.Register(add: fastSpringBoneBuffer, remove: m_fastSpringBoneBuffer);
+            m_fastSpringBoneBuffer = fastSpringBoneBuffer;
 
             m_building = false;
             return true;
diff --git a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
index 31153063d..e1660af07 100644
--- a/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
+++ b/Assets/VRM10/Runtime/Components/Vrm10Runtime/Vrm10FastSpringboneRuntimeStandalone.cs
@@ -54,7 +54,7 @@ namespace UniVRM10
 
         public void Dispose()
         {
-            m_bufferCombiner.Unregister(m_fastSpringBoneBuffer);
+            m_bufferCombiner.Register(add: null, remove: m_fastSpringBoneBuffer);
             m_fastSpringBoneBuffer.Dispose();
 
             m_fastSpringBoneScheduler.Dispose();
@@ -88,16 +88,9 @@ namespace UniVRM10
             }
             m_building = true;
 
-            // 登録削除
-            if (m_fastSpringBoneBuffer != null)
-            {
-                m_bufferCombiner.Unregister(m_fastSpringBoneBuffer);
-            }
-
-            m_fastSpringBoneBuffer = await FastSpringBoneBufferFactory.ConstructSpringBoneAsync(awaitCaller, m_instance, m_fastSpringBoneBuffer);
-
-            // 登録
-            m_bufferCombiner.Register(m_fastSpringBoneBuffer);
+            var fastSpringBoneBuffer = await FastSpringBoneBufferFactory.ConstructSpringBoneAsync(awaitCaller, m_instance, m_fastSpringBoneBuffer);
+            m_bufferCombiner.Register(add: fastSpringBoneBuffer, remove: m_fastSpringBoneBuffer);
+            m_fastSpringBoneBuffer = fastSpringBoneBuffer;
 
             m_building = false;
             return true;