A super-M mother whose life was taken away by her son. A woman driven mad by jealousy.

Yukari's son, Ryu, dropped out of high school due to bullying. Fearing his son's poor academic performance, Ryu's father hired his stepsister as his tutor to help him get back into school. However, this led to a breakdown in the mother-son relationship… In a secluded room, with only the two of them, the stepsister developed an extremely sadistic sexual desire for the virgin Ryu… Ryu, who only opened his heart to his mother, experienced a masochistic awakening due to sex…