Kiyoka raises her son Satoshi single-handedly. However, Satoshi is bullied at school and refuses to attend school. It was her classmate Yusei who helped her son recover. At first, Kiyoka was saved by his kindness, but... In fact, he is the mastermind behind the bullying, and now he is demanding money in return for helping Satoshi. Furthermore, Yusei gets carried away by her, seizes her weakness and demands her ripe body. Kiyoka learns a secret that she cannot tell her son, so she inserts a vibrator into her crotch as he tells her to do...