Kiyoka is raising her son Satoshi on her own. But Satoshi was bullied at high school and stopped going to school... It was his classmate Yusei who helped her son get back on his feet. At first, Kiyoka was saved by his kindness, but... In fact, he was the mastermind behind the bullying, and now he demands money in return for helping Satoshi. Yusei gets carried away and uses his weakness to demand her ripe body. Kiyoka, who knows the secret she cannot tell her son, does as he tells her and inserts a vibrator into her crotch...