After 15 years of marriage, Yui finally confirms her long-held suspicion that her husband is cheating. He admits the affair but then begins treating her even more harshly, while their daughter clings to her on sleepless nights as the family slowly falls apart. Wanting him to understand the pain of betrayal, Yui meets a man through a dating app, brings him home, and has conception role-play sex with him in front of her husband.