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Two couples engage in adulteries with each other then discover the joys of wife swapping when they meet another free spirited couple.

高木与菊田是相交多年的挚友，两对夫妻情同手足，常被旁人羡称为“兄妹夫妻”。然而，平静的生活因一次纪念日晚归而掀起惊涛骇浪。高木因工作延误回家，妻子和美负气出走，...