First-year student Mayumi Takahashi attends a junior high school called Sparta Academy (スパルタ学園, Suparuta Gakuen), 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".

Kekko Kamen is a female superhero whose costume consists solely of red boots, gloves, scarf and a mask with long bunny-like ears.

Her fighting style is graceful, and her finishing move involves driving the opponent to the ground with a flying headscissors takedown which presses her groin into the victim's face.

A four-episode original video animation adaptation of Kekko Kamen was created by Studio Signal and released by Nippon Columbia on two VHS tapes in 1991 and 1992.

[19][20] The OVA was also released in a dubbed version in Italy on VHS by Dynamic Italia in 2000 under the name Kekko Kamen: La maschera libidinosa.

A special story called "The Excellent - Kekko Kamen Gaiden" (THE エクセレント ～けっこう仮面外伝～), written by Shinobu Inokuma with co-operation from Nagai, was published in Business Jump in June 2011.

It takes place many years after the original manga where a new Kekko Kamen, whose secret identity is a new teacher in a new school owned by the remaining factions of the Toenail of Satan, protects young female students from the evil members of the organisation unfortunately one of them catches her.

[24][25] A one-shot crossover featuring Go Nagai's Kekko Kamen and Mazinger Z characters was written by Takeshi Okano and published in Grand Jump on January 16, 2013.

[26] Stig Høgset of Them Anime Reviews gave the Kekko Kamen OVAs two out of five stars, called the art passable, and clarified that while the jokes are smutty, they never get offensive.

[27] Reviewing for Anime News Network, Theron Martin wrote "Kekko Kamen is great (if nonsensical) fun as long as you're an adult who can appreciate oodles of fan service and raunchy, sometimes utterly tasteless, humor."