Fuufu Koukan: Modorenai Yoru  

Married Couple Swap, 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~

Reiji and his spouse went on a vacation with their companions at a traditional Japanese ryokan with the intention of conceiving a child. However, things took an unexpected turn when Reiji was seduced by his friend's spouse while his own spouse engaged in a passionate affair with their mutual friend. As they indulged in forbidden desires and pushed boundaries, could they ever regain the purity of their marriages?