A twisted couple with a swapping fetish implanted with NTR (Netorare) tendencies! Because she lent her innocent, naive commoner wife to a wealthy couple, she succumbed to immoral pleasure. (Kominato Yotsuba START-331)

The newlyweds, Yotsuba and her husband, hit it off with the couple living in the mansion next door. Even though they're newlyweds, the husband, Yuzuru, suffers from erectile dysfunction, leading to a sexless marriage. After being invited to a swapping session by their neighbor, Atsushi, he discovers he has an NTR fetish. The couple then drags the innocent and naive Yotsuba into a perverse and immoral quagmire of sexual harassment involving other men's penises…