Yukawa, a temporary bathhouse attendant, arrives at the public bathhouse run by Aya, a widowed proprietress. One day, Kozue and Shizuka—members of a junior college "bathhouse research club"—visit the establishment. Chaos erupts in the women’s section when a regular customer picks a fight with Kozue. Comforted and encouraged by Aya, Kozue finds a new spark and begins a romance with Nogata, the local milk deliveryman. Meanwhile, Shizuka hits it off with a regular named Toyoda over some drinks and proposes a unique arrangement: if she can help him overcome his impotence, he must pay for a trip abroad for her.