ゲーム再生終了時にパラメータをリセットする（ゲーム開始時の値に戻す）ScriptableObject

ResettableScriptableObject.cs

using UnityEngine;

public class ResettableScriptableObject : ScriptableObject 
{
#if UNITY_EDITOR
	[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
	private static void CallBeforPlayScene()
	{
	// recently, unity editor will crash
	// recommend SaveProject before playing
	//	UnityEditor.AssetDatabase.SaveAssets ();
	}
#endif

	protected virtual void OnEnable()
	{
#if UNITY_EDITOR
		if( UnityEditor.EditorApplication.isPlayingOrWillChangePlaymode == true ){
			UnityEditor.EditorApplication.playmodeStateChanged += () => {
				if( UnityEditor.EditorApplication.isPlayingOrWillChangePlaymode == false) {
                    Resources.UnloadAsset(this);
                }
            };
		}
#endif
	}
}

sample.cs

[CreateAssetMenu]
public class sample : ResettableScriptableObject
{
    [SerializeField] int count;

    public void Add()
    {
        count++;
    }
}