is a Japanese manga series written and illustrated by Go Nagai. It was serialized in Monthly Shōnen Jump from September 1974 to February 1978, with the chapters collected into five tankōbon volumes by Shueisha. It follows the misadventures of a student named Mayumi Takahashi who attends a boarding school called Sparta Academy that is run by sadistic psychopaths. The teachers are constantly looking for ways to torture or humiliate the students, and from this the teachers derive sexual satisfaction. Takahashi's only protection is from a mysterious nude female superhero—the titular Kekko Kamen. The manga has spawned an original video animation series and numerous live-action films. In North America, the OVAs were released by ADV Films, while several of the films were published by different distributors. Plot First-year student Mayumi Takahashi attends a junior high school called , where the penalty for any student (usually girls) making the slightest mistake is being sexually humiliated by the perverted, corrupt and misogynistic teachers running the school, the principal being a demonic, jester-like villain named "Toenail of Satan". However, before the teachers can take their sexual advances too far, Kekko Kamen steps in and delivers a sound beating to the teachers, and usually performs a finishing attack by jumping into the air and landing crotch-first onto her opponent's face. Characters A practically nude female superhero dressed only in a red, rabbit-eared mask, with matching gloves, scarf, and boots. She uses her body to distract the usually male enemy teachers that she fights in order to protect Sparta Academy's unfairly punished and harassed students, but, typically, she ends up coming to the defense of Mayumi Takahashi. She fights with a graceful and acrobatic martial arts style, as well as often using weapons to aid her, such as nunchuks and a bo staff. Her finishing move, the , involves her leaping into the air, spreading her legs, and landing groin-first on her typically male opponent's face, which knocks him out. The possibility of an outside intruder is ruled out, and the principal and faculty thus conclude that one of the students is the masked heroine. In the last chapter, it is revealed that Kekko Kamen has six secret identities—the belief that she only had one allowed each of her secret identities to remain uncovered, whilst giving each other alibis. In the end, the six are victorious, and the school is shut down, thanks to their efforts.