Two couples who are dissatisfied with each other's sex life are drowning in excitement far from everyday life.Hatanaka and his wife, Nozomi, who live in the neighborhood, consult Aoyama and his wife, Hana, about their troubles at night.Propose “swapping” to the two who are in a rut.Hatanaka and the others, who were skeptical at first, began to lean toward Aoyama's proposal.Nozomi, who saw Hatanaka and Hana violently disturbed each other, was shy but excited by the unprecedented stimulation.A husband who is excited by the appearance of a stranger's wife who holds her own meat stick, and a stranger's stick.The two couples who feel new excitement are invited to a new world by "swapping".