The son who is about to enter the workforce will soon leave home. Kei is happy that her son, whom she raised single-handedly, has grown up well, but at the same time feels lonely. Her beloved child is going to a place beyond her reach… On their last night together, Kei cannot hold back her emotions and slips into her son's futon. Her son feels the same way. They cross an unforgivable line and indulge in forbidden passion. However, her son's sex is far more intense and relentless than Kei expected. No matter how many times she climaxes, the continuous thrusting does not stop, and eventually, Kei falls into a world of madness…
