Wani no Yu is an old public bathhouse in a working-class neighborhood away from the nightlife district. Loved by locals since the postwar years, it has steadily lost customers now that private bathrooms are standard in most homes. Hoping to bring business back, the owner hires a married woman named Hitomi to provide body scrubs inside the men's bathing area. She works bashfully while surrounded by naked men and cocks, but her sexually frustrated body gradually begins to stir. As she scrubs a customer's entire body, her hand finally brushes against his swelling cock…