Tatsuya's wife left him after a massive marital fight. He tries his best to make up with her, but nothing goes well. Just then, his sister-in-law Kana, worried about the situation, offers to mediate the fight. Grateful for the helping hand, Tatsuya lets Kana into his house to seek her advice... but he can't hide his agitation as Kana closes the distance between them without any guard. He tries to escape by taking a bath, but then Kana suggests that they get in together...