Sparta Academy appears to be Japan’s most prestigious preparatory school, boasting the highest rate of admission to elite universities. In reality, it is a horrifying institution ruled by fear, where the sadistic principal known as the Toenail of Satan subjects students who fail to meet expectations to brutal, torture-like punishments. The faculty acts as his willing enforcers, devising ever more creative and humiliating torments. When a student is about to be subjected to this cruelty, a mysterious figure appears like a whirlwind. She is Kekko Kamen, a legendary heroine whose body is completely naked except for a red mask, red gloves, and red boots. Wielding nunchaku and showing no shame, she administers her own brand of violent justice to the would-be torturers, striking at the academy's reign of terror. The story follows the heroine’s battle against the depraved faculty as she works to weaken the Toenail of Satan’s grip on the school and protect its helpless students. Key characters include Mayumi, a good-natured student who finds herself at the mercy of the sadistic teachers, and the new Kekko Kamen herself, portrayed by actress Aino Kishi, whose true identity remains a secret. The narrative arc involves the heroine confronting increasingly perverse traps and enemies sent by the principal, all while the academy attempts to lure her out and destroy her. The tone is an over-the-top blend of erotic comedy and action-adventure, staying faithful to the original manga by Go Nagai. The climax centers on a final confrontation with the evil headmaster, as Kekko Kamen fights to end the cycle of torture and fear once and for all.