The only son of a single mother is a timid boy who is constantly bullied by his friends. Worried about her son, mother Naho scolds his friends, but ultimately falls into the precocious boys' trap, underestimating them as mere children. Before she realizes it, she's drawn into a disturbing routine where they use her son as a sexual outlet. Soon, Naho herself is violently forced to have sex with her own son and repeatedly receives creampie after creampie, dragged deeper into an increasingly twisted situation.