Yusuke, a ronin student, lives alone in an apartment without a bath. For Yusuke, who is immersed in studying every day, the only solace is his brother's wife, Nanako, who sometimes visits to give gifts. One day, Yusuke is invited to a public bath by Nanako. By chance, he ends up in the women's bath, and the distance between them grows closer. And after that, Nanako, who still hasn't gotten along well with his brother, invites Yusuke to the public bath.