The story follows and Sota , a married couple whose eight‑year marriage has settled into a comfortable, if predictable, routine. When an unexpected invitation arrives from an old college friend—who proposes a “couple‑swap” party for one night—Haruka and Sato are torn between curiosity and loyalty.
: In Japan, the series is often associated with Kadokawa’s digital or print imprints. You can find the original Japanese volumes on Amazon JP or CDJapan if you are a collector. 📽️ The Anime Adaptation fuufu koukan modorenai yoru manga link