A man who failed his college entrance exams and is now a ronin lives next door to a loud, obnoxious gyaru girl who parties every night. Ignored when he tries to complain and mocked for speaking up, his frustration builds until he finally snaps and decides on revenge. Late one night, after she sends a group of guys away, he sneaks up behind her. "Hey, don't gyaru girls love cowgirl? Shake that ass harder," he sneers, as the ronin and his friends launch a vicious cowgirl-position gang rape party targeting the girl. His daily stress and resentment transform into twisted, depraved desire.