Mature Young Wife: The Swapping

熟れた若妻　ザ・スワッピング

Also known as Ureta wakazuma: Za suwappingu, 危険な情事　若妻乱熟, Dangerous Affair: Young Wife's Wild Ripe, Kiken'najōji wakadzuma ranjuku, The Promiscuous Young Wife

Detective Nozawa persuades his wife, Akiko, to go to a swinger club. There, he meets Saeki and Etsuko, who live in the same apartment building, but shortly after, Etsuko's murdered body is discovered...