"It's not hard!" Yusuke was confused by his mother Rieko, who was on top of him and playing with his penis. But at the same time, he felt a sense of inadequacy. It had been three months since his father left. His mother, who had been drowning in loneliness with alcohol, had finally begun to rape her son, pushing him down. Unable to comfort his mother, Yusuke decided that it was a one-time mistake and accepted the forbidden relationship. But Rieko's body was so erotic that it turned the gentle son, who loved his mother, into a beast...