diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs b/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs
new file mode 100644
index 000000000..ce0a464d1
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace VRM
+{
+    /// <summary>
+    /// FastSpringBoneに関連して、特定のGameObjectと紐付いたIDisposableの破棄を担当するクラス
+    /// </summary>
+    public sealed class FastSpringBoneDisposer : MonoBehaviour
+    {
+        private readonly List<IDisposable> _disposables = new List<IDisposable>();
+
+        public void Add(IDisposable disposable)
+        {
+            _disposables.Add(disposable);
+        }
+        
+        private void OnDestroy()
+        {
+            foreach (var disposable in _disposables)
+            {
+                disposable.Dispose();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs.meta b/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs.meta
new file mode 100644
index 000000000..7f55e4b79
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneDisposer.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0b96d696de06439e97ac33ed2d890c88
+timeCreated: 1632893490
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs b/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs
new file mode 100644
index 000000000..356ab345c
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs
@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using UnityEngine;
+using VRM.FastSpringBones.Blittables;
+using VRM.FastSpringBones.Components;
+using VRMShaders;
+using Object = UnityEngine.Object;
+
+namespace VRM
+{
+    /// <summary>
+    /// 指定されたGameObject内にあるSpringBoneをFastSpringBoneに差し替えるユーティリティ
+    /// </summary>
+    public static class FastSpringBoneReplacer
+    {
+        public static async Task ReplaceAsync(GameObject gameObject, IAwaitCaller awaitCaller = null, CancellationToken token = default)
+        {
+            var service = FastSpringBoneService.Instance;
+            var springBones = gameObject.GetComponentsInChildren<VRMSpringBone>();
+            var disposer = gameObject.AddComponent<FastSpringBoneDisposer>();
+
+            // VRMSpringBoneで動いた後の状態がFastSpringBoneの初期状態にならないようにするためawait UniTask.Yield()する前にVRMSpringBoneをdisableにしておく
+            foreach (var springBone in springBones)
+            {
+                springBone.enabled = false;
+            };
+
+            if (awaitCaller != null)
+            {
+                await awaitCaller.NextFrame();
+                token.ThrowIfCancellationRequested();
+            }
+
+            var vrmColliderGroups = gameObject.GetComponentsInChildren<VRMSpringBoneColliderGroup>();
+            var colliderGroupDictionary = new Dictionary<VRMSpringBoneColliderGroup, FastSpringBoneColliderGroup>();
+
+            // Colliderを差し替える
+            foreach (var vrmColliderGroup in vrmColliderGroups)
+            {
+                if (awaitCaller != null)
+                {
+                    await awaitCaller.NextFrame();
+                    token.ThrowIfCancellationRequested();
+                }
+
+                var fastSpringBoneCollider = vrmColliderGroup.gameObject.AddComponent<FastSpringBoneColliderGroup>();
+                fastSpringBoneCollider.Initialize(
+                    service.TransformRegistry,
+                    vrmColliderGroup.Colliders
+                        .Select(data => new BlittableCollider(data.Offset, data.Radius))
+                        .ToArray()
+                );
+                colliderGroupDictionary[vrmColliderGroup] = fastSpringBoneCollider;
+            }
+
+            var springRootBones =
+            (
+                from springBone in springBones
+                from rootBone in springBone.RootBones
+                select (springBone, rootBone)
+            ).ToList();
+
+            for (var i = 0; i < springRootBones.Count; i++)
+            {
+                var current = springRootBones[i];
+
+                // 他のRootBoneのどれかが、自分の親（もしくは同じTransform）なら自分自身を削除する
+                if (springRootBones
+                    .Where(other => other != current)
+                    .Any(other => current.rootBone.IsChildOf(other.rootBone)))
+                {
+                    springRootBones.RemoveAt(i);
+                    --i;
+                }
+            }
+
+            if (awaitCaller != null)
+            {
+                await awaitCaller.NextFrame();
+                token.ThrowIfCancellationRequested();
+            }
+            token.ThrowIfCancellationRequested();
+
+            foreach (var (vrmSpringBone, rootBoneTransform) in springRootBones)
+            {
+                // FastSpringRootBoneに差し替える
+                var fastSpringRootBone = 
+                    new FastSpringRootBone(
+                        service.TransformRegistry,
+                        rootBoneTransform, 
+                        service.RootBoneRegistry,
+                        service.ColliderGroupRegistry);
+                disposer.Add(fastSpringRootBone);
+
+                var colliderGroups =
+                    vrmSpringBone.ColliderGroups != null
+                        ? vrmSpringBone.ColliderGroups.Select(group => colliderGroupDictionary[@group]).ToArray()
+                        : Array.Empty<FastSpringBoneColliderGroup>();
+
+                fastSpringRootBone.Initialize(
+                    vrmSpringBone.m_gravityPower,
+                    vrmSpringBone.m_gravityDir,
+                    vrmSpringBone.m_dragForce,
+                    vrmSpringBone.m_stiffnessForce,
+                    colliderGroups,
+                    vrmSpringBone.m_hitRadius,
+                    vrmSpringBone.m_center
+                );
+
+                Object.Destroy(vrmSpringBone);
+                
+                if (awaitCaller != null)
+                {
+                    await awaitCaller.NextFrame();
+                    token.ThrowIfCancellationRequested();
+                }
+                token.ThrowIfCancellationRequested();
+            }
+
+            // Colliderを削除
+            foreach (var vrmSpringBoneColliderGroup in vrmColliderGroups)
+            {
+                Object.Destroy(vrmSpringBoneColliderGroup);
+            }
+        }
+    }
+}
diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs.meta b/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs.meta
new file mode 100644
index 000000000..76ca1edb5
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneReplacer.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: a344a05a3634bac419be8a218d8b85d6
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs b/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs
new file mode 100644
index 000000000..86fab4112
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs
@@ -0,0 +1,54 @@
+using UnityEngine;
+using VRM.FastSpringBones.Components;
+using VRM.FastSpringBones.Registries;
+
+namespace VRM
+{
+    /// <summary>
+    /// Scene 上に単一で存在する、FastSpringBone の ServiceLocator 兼 EntryPoint
+    /// </summary>
+    public class FastSpringBoneService : MonoBehaviour
+    {
+        public RootBoneRegistry RootBoneRegistry { get; private set; }
+        public TransformRegistry TransformRegistry { get; private set; }
+        public ColliderGroupRegistry ColliderGroupRegistry { get; private set; }
+        public FastSpringBoneScheduler FastSpringBoneScheduler { get; private set; }
+
+        private static FastSpringBoneService _instance;
+
+        public static FastSpringBoneService Instance
+        {
+            get
+            {
+                if (!_instance)
+                {
+                    var gameObject = new GameObject("FastSpringBone Service");
+                    DontDestroyOnLoad(gameObject);
+                    _instance = gameObject.AddComponent<FastSpringBoneService>();
+                }
+                return _instance;
+            }
+        }
+
+        /// <summary>
+        /// 専有しているインスタンスを破棄する
+        /// </summary>
+        public static void Free()
+        {
+            Destroy(_instance.gameObject);
+            _instance = null;
+        }
+
+        private void Awake()
+        {
+            RootBoneRegistry = new RootBoneRegistry();
+            TransformRegistry = new TransformRegistry();
+            ColliderGroupRegistry = new ColliderGroupRegistry();
+            FastSpringBoneScheduler = gameObject.AddComponent<FastSpringBoneScheduler>();
+            FastSpringBoneScheduler.Initialize(
+                RootBoneRegistry,
+                TransformRegistry,
+                ColliderGroupRegistry);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs.meta b/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs.meta
new file mode 100644
index 000000000..8db972822
--- /dev/null
+++ b/Assets/VRM/Runtime/SpringBone/FastSpringBoneService.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 7c3edad580b54158b37169025a1e207d
+timeCreated: 1632894654
\ No newline at end of file
diff --git a/Assets/VRM/Runtime/VRM.asmdef b/Assets/VRM/Runtime/VRM.asmdef
index 053d4f4d5..c89f8bc23 100644
--- a/Assets/VRM/Runtime/VRM.asmdef
+++ b/Assets/VRM/Runtime/VRM.asmdef
@@ -5,7 +5,8 @@
         "GUID:8d76e605759c3f64a957d63ef96ada7c",
         "GUID:da3e51d19d51a544fa14d43fee843098",
         "GUID:301b251fd9834274c9228e0532f444f7",
-        "GUID:a9bc101fb0471f94a8f99fd242fdd934"
+        "GUID:a9bc101fb0471f94a8f99fd242fdd934",
+        "GUID:ac229b552c3025545b074203f857547c"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],