Several young couples travel to a private island for a mysterious training retreat that promises to strengthen their relationship. However, during the Retreat, the heroes encounter an ancient demon - a Succubus. This monster feeds on the life energy of people, taking on someone else's appearance and provoking victims to show the worst qualities and do terrible things.“彤彤，海灵，你们留在大姨这里吃饭。”商太太看时间，便留两个外甥女吃饭，她又摸摸阳阳的头，“阳阳，在姨婆家里玩一天再回去好不好？”