Star agent and undercover bruiser investigator for the government agency Zeus, Hoshino Ririka infiltrates her latest target: the prestigious private school, Kurenai Rose Academy, suspected of turning colleagues into invalids. However, she soon faces brutal torture and trials inflicted by the masked female principal and her heretical faculty. Armed with the pride of a top agent and the conviction to protect her comrades, she pushes forward through overwhelming hardship. Yet, this battle proves far more grueling than anticipated.