Ronin student Yusuke lives alone in an apartment without a bath.For Yusuke, who is immersed in his studies every day, Nanako, his older brother's wife, who sometimes visits him, is the only comfort.One day, Yusuke is invited to a public bath by Nanako.He happened to enter the women's bath, and the distance between the two grew closer.And after that, Nanako, who doesn't get along well with his brother, invites Yusuke to the public bath, but the bandai finds him in the women's bath again.