After a huge fight with his wife, Tatsuya's wife left him. He tries to make amends but it doesn't work out. At that time, his sister-in-law Kana is worried about him and offers to mediate the fight. Tatsuya is grateful for her help and invites Kana over to his house to ask for advice, but he can't hide his agitation as Kana closes in on him defenselessly. He runs away to the bath, but Kana asks him to join her.