A husband, Take, who loves his wife, Yumi, but is troubled by his cuckold desires, one day shows her a couple exchange site and confesses his troubles. Although Yumi is bewildered, for her husband's sake, she agrees to attend an offline event organized by the site, with the promise of only one time. There, another couple, the Nakamuras, is waiting. Although Chie, the other wife, is also uneasy, after receiving a lecture from the organizer, Sakurai, the two couples swap wives, husbands, and immerse themselves in an unprecedentedly lewd copulation...
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