Several years after divorcing her husband, beautiful single mother Namiki Toko lives alone with her son. Having dedicated herself to work and raising her child, she has maintained the pure image of a devoted mother—until one day, the deep-seated feminine desire buried within her becomes impossible to suppress. This is no mere craving, but a primal instinct. One day, Toko begins an affair with her boss at work. But that night, upon returning home, she fails to notice the lustful gaze of her son watching her. Behind the bond of mother and son lies a forbidden relationship between a woman in her late thirties yearning for passion and a teenage boy at the peak of his sexual desire. Raw blowjob, bareback penetration, creampie after creampie… A torrent of taboo intercourse erupts between mother and son. This is the story of love that crosses the line—into forbidden territory.