Maki can't hide her joy when her son, Kazuya, who was a shy and bullied child, brought his childhood friend Junkichi. In fact, Junkichi is the ringleader of the bullying, and Maki begins to close the distance without realizing it. Junkichi, who shows an abnormal obsession with his mother in a fatherless family, takes advantage of her kindness and pushes her down. Maki cums every time she is rubbed violently in the back of the vagina wall that has not been touched for a long time. In reason, while rejecting him, the body gradually can not suppress the pain of the uterus ....