Young innkeeper Kaori (Atsuko Kurusu) lives with her ex-husband Takeshi and her younger sister Rina, all three running a hot spring ryokan together. On the surface, their household appears harmonious, but beneath lies a growing turmoil of hidden emotions. Amidst her relationships with her former husband, the bond with her sister, and the daily routines of the inn, suppressed desires begin to surface, gradually distorting their dynamic. As tangled feelings collide, their emotional entanglement spirals into an increasingly erotic and chaotic collapse.