Portrayed by: Chris Aoki A first year student at the Sparta Academy. Mayumi is an innocent and good-natured girl, but her failure to meet the school's high academic standards often lands her in the school's torture chamber, where she is subjected to humiliating punishments. However, before the teachers are about to completely violate her, Kekko Kamen always bursts in and save the day. Her heroine's constant rescuing of her has filled Mayumi with a deep amount of affection for her, but she is often used by the principal and faculty as bait to lure Kekko Kamen into a trap. Portrayed by: Yumi Goto (1991 Movie), Rie Nakano (1992 Movie), Juri Inahara (2004 Movie) The main antagonist and wicked principal of Sparta Academy, who dresses in a fearsome white demon mask and jester hood. He is extremely perverted and obtains satisfaction from sexually humiliating the bodies of female students, especially that of Mayumi Takahashi. This brings him into conflict with Kekko Kamen, whose secret identity he wishes to uncover, so that he may destroy her. To accomplish this, he exhorts various punishment councillors into publicly humiliate Takahashi, using her as bait to bring the naked warrior of justice out in the open, but she always defeats him. Portrayed by: Paul Maki, Hajime Tsukumo A perverted, insane, abusive, sadistic, mad scientist teacher who works for Toenail of Satan. He always punishes Mayumi Takahashi for her substandard grades, but is then put in his place by Kekko Kamen. A shy, introverted second year student. When Mayumi sees her bare body during an examination intended to unmask Kekko Kamen, her reaction shows that she believes the heroine is Chigusa, but Kekko Kamen suddenly appears and declares that they suspected the wrong person. However, Chigusa actually does have a secret—she is actually two people, the twins Chigusa and Yuka, enrolling as one student due how poor their family is. When their secret is discovered, the twins are accused of being Kekko Kamen, and tortured, but are again cleared of suspicion when Kekko Kamen arrives to save them and Mayumi. In the last chapter, however, it is revealed that the twins really were Kekko Kamen, alongside four others. A tough, popular Physical Education teacher, and an expert at various styles of fighting techniques, sports, and with many types of weapons—this caused the principal to suspect that she was actually Kekko Kamen, so he began to humiliate