diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs
new file mode 100644
index 000000000..836edeeaa
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs
@@ -0,0 +1,61 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace UniGLTF
+{
+    /// <summary>
+    /// await で post される先を１次的に乗っ取る
+    /// </summary>
+    public class TemporarySynchronizationContext : SynchronizationContext
+    {
+        Queue<Action> m_callbacks = new Queue<Action>();
+
+        public override void Post(SendOrPostCallback d, object state)
+        {
+            m_callbacks.Enqueue(() => d(state));
+        }
+
+        public void ExecuteSync()
+        {
+            while (m_callbacks.Count > 0)
+            {
+                var callback = m_callbacks.Dequeue();
+                callback();
+            }
+        }
+
+        public IEnumerator AsCoroutine()
+        {
+            throw new NotImplementedException();
+        }
+
+        public Task AsTask()
+        {
+            // repost to SynchronizationContext.Current
+            throw new NotImplementedException();
+        }
+
+        class Hijacker : IDisposable
+        {
+            SynchronizationContext m_backup;
+            public Hijacker(SynchronizationContext context)
+            {
+                m_backup = SynchronizationContext.Current;
+                SynchronizationContext.SetSynchronizationContext(context);
+            }
+
+            public void Dispose()
+            {
+                SynchronizationContext.SetSynchronizationContext(m_backup);
+            }
+        }
+
+        public IDisposable Hijack()
+        {
+            return new Hijacker(this);
+        }
+    }
+}
diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs.meta b/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs.meta
new file mode 100644
index 000000000..c96a371af
--- /dev/null
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/TemporarySynchronizationContext.cs.meta
@@ -0,0 +1,11 @@
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