Mio Kimijima deeply cares for her son Hiro, who she knows is being bullied by a group of delinquent classmates. One day, Hiro reaches his breaking point and shoves Masato, the ringleader of the bullies, causing him to get injured. Masato's father then shows up at the Kimijima household demanding an apology. With the school involved, Masato's father erupts in anger—but soon shifts his focus to Mio's sexy body, proposing that if she serves him sexually, he'll forgive the incident. Though conflicted, Mio agrees solely to protect her son. However, Masato secretly records the encounter, and soon Mio becomes the sexual target of the entire group of delinquents in a twisted revenge scheme.