The story centres on two married couples, Mihara Asuka and Kousuke, and Suzukawa Akana and Reiji, who have been close friends since their student days. On a trip together, the couples visit an onsen spa, where they decide to swap partners…
夫婦交歓 ~戻れない夜~, Fuufu Koukan: Modorenai Yoru, Marriage Exchange: The Night of No Return, Marriage Exchange: Amazing Extramarital Sex Compared to My Husband, Married Couple Swap: He’s Better Than My Husband, 夫婦交歓 ~戻れない夜~
ep2