_nowGameStatus; set { statusSubject .OnNext(value); _nowGameStatus = value; } } private GameStatus _nowGameStatus; public IObservable<GameStatus> OnGameStatusChanged => statusSubject; private Subject<GameStatus> statusSubject = new Subject<GameStatus>(); GameManager.instance.OnGameStatusChanged.Subscribe(x => { 実行したいこと }).AddTo(this); GameManager 購読する側