"fuufu koukan: modorenai yoru" —その言葉が呼び起こすのは、静寂の中で交わされる交換、そしてもう戻れない夜の温度だ。
As indicated by the subtitle Modorenai Yoru ("The Night of No Return"), the central conflict revolves around whether the couples can ever reclaim the "innocence" of their original marriages after crossing such a boundary. fuufu koukan: modorenai yoru
A mutual friend who actively participates in the exchange. fuufu koukan: modorenai yoru
The "grass is greener" mentality when seeing a friend's partner. The "Point of No Return": As the title suggests ( Modorenai Yoru fuufu koukan: modorenai yoru