Fuufu Koukan: Modorenai Yoru (夫婦交換 ～戻れない夜～), Season 1, is a Japanese adult-oriented drama series that falls under the "fuufu koukan" (couple swapping) genre, a niche but persistent subgenre in Japanese live-action adult entertainment and late-night TV dramas. The series explores the psychological, emotional, and sexual consequences when two married couples agree to swap partners for a single night. The subtitle "Modorenai Yoru" ("A Night of No Return") signals the central premise: that the act irrevocably alters the relationships, leading to jealousy, rediscovered passion, or emotional collapse.
Fuufu Koukan: Modorenai Yoru, also known as "Fateful Encounter: An Unreturning Night," is a romantic comedy anime series that premiered in 2021. The show revolves around the story of Takanori Arisawa, a 30-year-old man who, after a night of drinking, wakes up next to a woman named Ririka Koubayakawa, a 29-year-old kindergarten teacher, in a hotel room. With no memory of the previous night and no way to contact each other, they make a promise to meet again in a month. fuufu koukan: modorenai yoru season 1