her. This ceased when Kekko Kamen jumped in to rescue her. She would come under suspicion of being Kekko Kamen more than once, and was accused of hiding Kekko Kamen's identity when her sister came under suspicion of being the heroine. In the last chapter, it is revealed that she indeed was Kekko Kamen, alongside Chigusa, Yuka and three others. A supposedly first year male student, who is in the same class as Mayumi. However, another student uncovered that "he" was actually a female in disguise. This prompted the Principal to believe that she was Kekko Kamen. When her true gender was unveiled, Keiko suddenly rushed in to save her, and confessed that she was Koichi's older sister. Both sisters were then tortured until Kekko Kamen came to their rescue. After this revelation, Koichi continued to be a valuable friend and ally of Mayumi. She, her sister, and Chigusa would come under suspicion again, but were proven innocent each time. In the last chapter, she reveals herself to be Kekko Kamen, alongside her sister, the twins Chigusa and Yuka, and two others. A young student who is positively infatuated with Kekko Kamen, and is inspired to become a heroine of justice herself. So, armed with a rapier, she becomes the mostly nude, caped, swashbuckling hero with a ribbon covering her crotch known as . However, on her first attempt to combat the evil of the school, Ai finds herself in danger. Fortunately, Kekko Kamen comes to her rescue. After this incident, Ai continued to appear sporadically throughout the manga as a supporting character. The very attractive school nurse. After Kekko Kamen's thigh is injured in a battle, the villain traces her to the infirmary, and confronts Kaori, ripping off her clothing in an attempt to find the scar, only to discover that it isn't there. Kekko Kamen appears, a bandage on her thigh, rescuing her, and eliminating her as a suspect. In the last chapter, however, she is revealed to be Kekko Kamen, alongside Chigusa, Yuka, Keiko and Koichi. A red-haired, chain smoking, tough-as-nails third-year student—she is a gang leader who makes sure everyone knows their place when dealing with her, and she hardly comes to class. When seeing Kei walk away from her, Mayumi is immediately reminded of someone else, but she quickly dismisses the thought. Shortly afterwards, Mayumi is accosted by Toenail of Satan, and Kekko Kamen jumps