The narrative follows four main protagonists as they navigate the consequences of their "returnless night": Voiced by Yuuto Suzuki. Kanade Suzukawa: Reiji's wife, voiced by Amu Mochiri. Kousuke Mihara: Voiced by Tapioca Kuroi.
The story follows two married couples who have been close friends since their student days: , and Akana and Reiji Suzukawa . During a joint vacation at a hot spring (onsen) resort, a series of unexpected events and hidden tensions lead the four friends to engage in a "partner swap". What starts as a potentially singular encounter quickly evolves into a complex web of emotions and physical attraction, as the couples find themselves unable to return to their original, "normal" marital lives—hence the subtitle "The Night of No Return". Characters and Cast animeonlineninja fuufu koukan modorenai yoru new