Four couples who have a close relationship. However, only Kamihata's husband is a biased person, and he continues to refuse other couples steadfastly. One day, Kamihata's husband, who was furious at the fake cheating report issued by the detective agency, went out of control to kill his wife in front of the other husbands' eyes. However, due to the betrayal of the detective, even his wife will be overrun.