Fuufu Koukan: Modorenai Yoru is an erotic anime series that follows the lives of two married couples, Mihara Asuka and Kousuke, and Suzukawa Akana and Reiji. These couples have been close friends since their student days and decide to spice up their lives by swapping partners during a trip to an onsen spa. The story unfolds as the characters find themselves drawn to the person they were meant to be with, not through insults or demeaning their spouses, but through better compatibility.

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