Mary, who lives in a certain town, is worried about balancing accounting work, cleaning duty, and family life. One day, as his dissatisfaction with the town grows day by day, he is asked by the chairman, Nakata, to participate in a Mama-san volleyball tournament. Unable to refuse, Mary reluctantly heads to practice, which is held every Saturday, but for some reason there are only a few middle-aged men there. The middle-aged men quickly help the confused Mary change her clothes and, with glaring eyes, give sexual harassment guidance to the voluptuous Mary...