High schooler Tanukichi Okuma transfers to the country's most morally upstanding school to be near Anna Nishikinomiya, the student council president he has loved since childhood, in a Japan that outlawed coarse language and sexual content sixteen years earlier. He's quickly blackmailed by Ayame Kajou into joining SOX, an underground group staging acts of obscene rebellion, and finds himself targeting Anna's own campaign against indecency. This original light novel spans the full story that later spun off a manga and an anime series.