A two-person life with my mother-in-law began with my wife's pregnancy hospitalization. The figure standing in the kitchen, the hands hanging laundry, the woman's charm seeping into everyday life. Gradually, my heart and body react to my mother-in-law Ayako's soft smile and seductive gestures. "Are you... inviting me?" From a single word that slipped out, my reason collapses. Ayako also forgets her position as a mother-in-law and son-in-law and abandons herself to a single night's mistake.