diff --git a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs b/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs
deleted file mode 100644
index 5e46bd1..0000000
--- a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs
+++ /dev/null
@@ -1,121 +0,0 @@
-#nullable enable
-
-using System.Collections.Concurrent;
-using System.Runtime.CompilerServices;
-
-namespace UniTaskPlus.Internal
-{
-    /// <summary>
-    /// A reference tuple with a thread-safe pool. Intended for use in situations where boxing would occur with <see cref="System.ValueTuple"/>.
-    /// </summary>
-    internal static class StateTuple
-    {
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static StateTuple<T1> Create<T1>(T1 item1) => StateTuple<T1>.Create(item1);
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static StateTuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2) => StateTuple<T1, T2>.Create(item1, item2);
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static StateTuple<T1, T2, T3> Create<T1, T2, T3>(T1 item1, T2 item2, T3 item3) => StateTuple<T1, T2, T3>.Create(item1, item2, item3);
-    }
-
-    internal sealed class StateTuple<T1>
-    {
-        private static readonly ConcurrentQueue<StateTuple<T1>> s_pool = new();
-
-        private T1 _item1 = default!;
-
-        private StateTuple()
-        {
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static StateTuple<T1> Create(T1 item1)
-        {
-            if (s_pool.TryDequeue(out var result))
-            {
-                result._item1 = item1;
-                return result;
-            }
-            return new StateTuple<T1> { _item1 = item1 };
-        }
-
-        public void Deconstruct(out T1 item1)
-        {
-            item1 = _item1;
-            _item1 = default!;
-            s_pool.Enqueue(this);
-        }
-    }
-
-    internal sealed class StateTuple<T1, T2>
-    {
-        private static readonly ConcurrentQueue<StateTuple<T1, T2>> s_pool = new();
-
-        private T1 _item1 = default!;
-        private T2 _item2 = default!;
-
-        private StateTuple()
-        {
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static StateTuple<T1, T2> Create(T1 item1, T2 item2)
-        {
-            if (s_pool.TryDequeue(out var result))
-            {
-                result._item1 = item1;
-                result._item2 = item2;
-                return result;
-            }
-            return new StateTuple<T1, T2> { _item1 = item1, _item2 = item2 };
-        }
-
-        public void Deconstruct(out T1 item1, out T2 item2)
-        {
-            item1 = _item1;
-            item2 = _item2;
-            _item1 = default!;
-            _item2 = default!;
-            s_pool.Enqueue(this);
-        }
-    }
-
-    internal sealed class StateTuple<T1, T2, T3>
-    {
-        private static readonly ConcurrentQueue<StateTuple<T1, T2, T3>> s_pool = new();
-
-        private T1 _item1 = default!;
-        private T2 _item2 = default!;
-        private T3 _item3 = default!;
-
-        private StateTuple()
-        {
-        }
-
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        internal static StateTuple<T1, T2, T3> Create(T1 item1, T2 item2, T3 item3)
-        {
-            if (s_pool.TryDequeue(out var result))
-            {
-                result._item1 = item1;
-                result._item2 = item2;
-                result._item3 = item3;
-                return result;
-            }
-            return new StateTuple<T1, T2, T3> { _item1 = item1, _item2 = item2, _item3 = item3 };
-        }
-
-        public void Deconstruct(out T1 item1, out T2 item2, out T3 item3)
-        {
-            item1 = _item1;
-            item2 = _item2;
-            item3 = _item3;
-            _item1 = default!;
-            _item2 = default!;
-            _item3 = default!;
-            s_pool.Enqueue(this);
-        }
-    }
-}
\ No newline at end of file
diff --git a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs.meta b/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs.meta
deleted file mode 100644
index 07b2bb5..0000000
--- a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Runtime/Internal/StateTuple.cs.meta
+++ /dev/null
@@ -1,3 +0,0 @@
-fileFormatVersion: 2
-guid: 8680a30b2d794366aba6b36c95067d6b
-timeCreated: 1771836385
\ No newline at end of file
diff --git a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Tests/Runtime/UniTaskPlusTests.cs b/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Tests/Runtime/UniTaskPlusTests.cs
index f761dac..dcab604 100644
--- a/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Tests/Runtime/UniTaskPlusTests.cs
+++ b/src/UniTaskPlus.Unity/Packages/jp.andantetribe.unitaskplus/Tests/Runtime/UniTaskPlusTests.cs
@@ -7,7 +7,6 @@
 using System.Threading;
 using Cysharp.Threading.Tasks;
 using NUnit.Framework;
-using UniTaskPlus;
 using UniTaskPlus.Internal;
 using UnityEngine.TestTools;
 
@@ -47,51 +46,6 @@ public void GrowWhenArrayHasContentCopiesAndClears()
         }
     }
 
-    public class StateTupleTests
-    {
-        [Test]
-        public void StateTuple1CreateAndDeconstructUsesPool()
-        {
-            var tuple = StateTuple.Create(1);
-            tuple.Deconstruct(out var item1);
-            Assert.That(item1, Is.EqualTo(1));
-
-            var tuple2 = StateTuple.Create(2);
-            tuple2.Deconstruct(out var item2);
-            Assert.That(item2, Is.EqualTo(2));
-        }
-
-        [Test]
-        public void StateTuple2CreateAndDeconstructUsesPool()
-        {
-            var tuple = StateTuple.Create(1, "A");
-            tuple.Deconstruct(out var i1, out var s1);
-            Assert.That(i1, Is.EqualTo(1));
-            Assert.That(s1, Is.EqualTo("A"));
-
-            var tuple2 = StateTuple.Create(2, "B");
-            tuple2.Deconstruct(out var i2, out var s2);
-            Assert.That(i2, Is.EqualTo(2));
-            Assert.That(s2, Is.EqualTo("B"));
-        }
-
-        [Test]
-        public void StateTuple3CreateAndDeconstructUsesPool()
-        {
-            var tuple = StateTuple.Create(1, "A", 0.5f);
-            tuple.Deconstruct(out var i1, out var s1, out var f1);
-            Assert.That(i1, Is.EqualTo(1));
-            Assert.That(s1, Is.EqualTo("A"));
-            Assert.That(f1, Is.EqualTo(0.5f));
-
-            var tuple2 = StateTuple.Create(2, "B", 1.5f);
-            tuple2.Deconstruct(out var i2, out var s2, out var f2);
-            Assert.That(i2, Is.EqualTo(2));
-            Assert.That(s2, Is.EqualTo("B"));
-            Assert.That(f2, Is.EqualTo(1.5f));
-        }
-    }
-
     public class UniTaskNodeTests
     {
         [UnityTest]