Yusuke, a student who has failed entrance exams, lives alone in an apartment without a bath. The only place where Yusuke can relax is when his brother's wife, Nanako, comes over to bring him snacks every day. One day, Nanako invites Nanako to the public bath. By chance, they end up in the women's bath, and the two of them grow closer. Nanako things still don't go well with her brother, Nanako starts inviting Yusuke to the bath, but the two are found by the attendant again when they go into the women's bath together...