Fuufu Koukan: Modorenai Yoru (Married Couple Swap: A Night They Can’t Return From) Genre: Adult Drama, Psychological, Romance, Erotica (18+)

: Kousuke’s wife. She is often the central figure in promotional materials and is voiced by Cinnamon Yatsuhashi Kousuke Mihara : Asuka’s husband, voiced by Tatobioka Kuroi Kanade Suzukawa

The title itself is a declaration of irreversible entropy. The central delusion of the characters is that they can compartmentalize the act—that they can step into the abyss, experience the taboo, and then step back into their normal lives the next morning.

The narrative focuses on two couples who have been close friends since their student days: Asuka and Kousuke Mihara Kanade and Reiji Suzukawa