"Welcome to the wife swapping party. I'm Tada, the organizer." There's a tense atmosphere among the five couples who have gathered at the venue... each couple has their own worries and desires. Yuka Tada, a wife, attends a party prepared by her sexually impotent husband. Momoko Issei, a married woman, brings her son along, pretending to be her husband. Maki Tomoda , a married woman who wants to keep her young lover. Hiraoka Rieko, who is a serious woman and therefore has no sex with her husband. Yuka Mizuno Rieko Hiraoka , whose husband has a habit of cheating. Amidst a web of various intentions, the swapping party begins...