Two couples who were dissatisfied with each other's sexual life drowned in excitement far from everyday life. - Hatanaka and his wife, Nozomi, who live in the neighborhood, discuss the troubles of night life with Aoyama and his wife, Hana. - We propose "swapping" to the two who have become rut. - Hatanaka and his colleagues, who were skeptical at the beginning, are inclined to Aoyama's proposal. - Nozomi sees Hatanaka in a violently disturbed appearance, and although she is ashamed, she is excited by the unprecedented stimulus. - The bride of another person who holds her own cock, and the husband who is excited about the appearance of exposing the foolery with another person's stick. - The two couples who got new excitement are invited to a new world by "swapping". More..