diff --git a/Editor/Commandline.cs b/Editor/Commandline.cs
index ebc35ee..32abfa2 100644
--- a/Editor/Commandline.cs
+++ b/Editor/Commandline.cs
@@ -119,7 +119,7 @@ private static void OnChangePlayModeState(PlayModeStateChange playModeStateChang
             // Exit Unity when returning from play mode to edit mode.
             // Because it may freeze when exiting without going through edit mode.
             var exitCode = (int)AutopilotState.Instance.exitCode;
-            Debug.Log($"Exit Unity-editor by autopilot, exit code={exitCode}");
+            Debug.Log($"Exit Unity-editor by autopilot, exit code: {(int)exitCode}");
             EditorApplication.Exit(exitCode);
         }
     }
diff --git a/Runtime/Autopilot.cs b/Runtime/Autopilot.cs
index c291d6e..70e60a0 100644
--- a/Runtime/Autopilot.cs
+++ b/Runtime/Autopilot.cs
@@ -145,10 +145,10 @@ public async UniTask TerminateAsync(ExitCode exitCode, string message = null, st
                 JUnitReporter.Output(_state.settings.junitReportPath, (int)exitCode, message, stackTrace, time);
             }
 
-            DestroyImmediate(this.gameObject);
+            Destroy(this.gameObject);
 
             _logger.Log("Terminate Autopilot");
-            await Launcher.TeardownLaunchAutopilotAsync(_state, _logger, exitCode, "Autopilot", token);
+            Launcher.TeardownLaunchAutopilotAsync(_state, _logger, exitCode, "Autopilot").Forget();
         }
 
         [Obsolete("Use " + nameof(TerminateAsync))]
diff --git a/Runtime/Launcher.cs b/Runtime/Launcher.cs
index 88eee4a..75f5f7f 100644
--- a/Runtime/Launcher.cs
+++ b/Runtime/Launcher.cs
@@ -11,8 +11,8 @@
 using DeNA.Anjin.Attributes;
 using DeNA.Anjin.Settings;
 using DeNA.Anjin.Utilities;
-using NUnit.Framework;
 using UnityEngine;
+using Assert = UnityEngine.Assertions.Assert;
 using Object = UnityEngine.Object;
 #if UNITY_INCLUDE_TESTS
 using NUnit.Framework;
@@ -217,8 +217,8 @@ private static Dictionary<int, List<MethodInfo>> GetOrderedInitializeOnLaunchAut
 #endif
         }
 
-        internal static async UniTask TeardownLaunchAutopilotAsync(AutopilotState state, ILogger logger,
-            ExitCode exitCode, string caller, CancellationToken token = default)
+        internal static async UniTaskVoid TeardownLaunchAutopilotAsync(AutopilotState state, ILogger logger,
+            ExitCode exitCode, string caller)
         {
             state.settings = null;
             state.exitCode = exitCode;
@@ -229,7 +229,7 @@ internal static async UniTask TeardownLaunchAutopilotAsync(AutopilotState state,
                 // Play mode tests
                 if (TestContext.CurrentContext != null && exitCode != ExitCode.Normally)
                 {
-                    throw new AssertionException($"{caller} failed with exit code {exitCode}");
+                    throw new AssertionException($"{caller} failed with exit code {(int)exitCode}");
                 }
 #endif
                 return; // Only terminate autopilot run if starting from play mode.
@@ -242,7 +242,7 @@ internal static async UniTask TeardownLaunchAutopilotAsync(AutopilotState state,
 
                 // XXX: Avoid a problem that Editor stay playing despite isPlaying get assigned false.
                 // SEE: https://github.com/DeNA/Anjin/issues/20
-                await UniTask.NextFrame(token);
+                await UniTask.NextFrame();
 #if UNITY_EDITOR
                 EditorApplication.isPlaying = false;
                 // Note: If launched from the command line, `DeNA.Anjin.Editor.Commandline.OnChangePlayModeState()` will be called, and the Unity editor will be terminated.
@@ -251,7 +251,7 @@ internal static async UniTask TeardownLaunchAutopilotAsync(AutopilotState state,
             else
             {
                 // Player build launch from commandline
-                logger.Log($"Exit Unity-player by {caller}, exit code={exitCode}");
+                logger.Log($"Exit Unity-player by {caller}, exit code: {(int)exitCode}");
                 Application.Quit((int)exitCode);
             }
         }
diff --git a/Runtime/Settings/AutopilotSettings.cs b/Runtime/Settings/AutopilotSettings.cs
index eb2680e..177d59c 100644
--- a/Runtime/Settings/AutopilotSettings.cs
+++ b/Runtime/Settings/AutopilotSettings.cs
@@ -8,8 +8,8 @@
 using DeNA.Anjin.Attributes;
 using DeNA.Anjin.Loggers;
 using DeNA.Anjin.Reporters;
-using NUnit.Framework;
 using UnityEngine;
+using UnityEngine.Assertions;
 
 namespace DeNA.Anjin.Settings
 {
@@ -241,7 +241,7 @@ public void OverrideByCommandLineArguments(Arguments args)
         private static void Initialize()
         {
             var settings = AutopilotState.Instance.settings;
-            Assert.NotNull(settings);
+            Assert.IsNotNull(settings);
 
             settings.ConvertLoggersFromObsoleteLogger(); // Note: before create default logger.
             settings.CreateDefaultLoggerIfNeeded();