Saki, a timid child, is constantly bullied by his friends. His mother, Saki Hiiragi, notices her son's suffering and decides to confront the boys, hoping to stop the bullying. However, she falls into a trap set by the precocious teens, who are driven by their raging adolescent desires. As they manipulate and overwhelm her, her maternal instinct to protect her son gradually spirals into a twisted sexual relationship. Her deep love and concern for her child become the very force that controls her actions, pulling her deeper into their depraved games.