The leader of the bratty student council, seeking revenge after being reprimanded by PTA president 'Yuna', plots retaliation. He uncovers information that Yuna has been using her son to satisfy her sexual desires, then uses this secret as blackmail to lure her into a bathroom where he and his friends gang rape her. Afterwards, he continues to act in shockingly cruel ways. The delinquents' rampage spirals further out of control.