The live-action adaptations of Kekko Kamen take place within the walls of Sparta Academy, a prestigious but deeply corrupt boarding school. Under the iron fist of its principal, a demonic jester-like figure known as the Toenail of Satan, the institution has abandoned education in favor of systematic sadism. The faculty, a collection of perverted and misogynistic punishment counselors, subject students, particularly young girls, to humiliating and often sexually charged tortures for any infraction, from poor grades to perceived insolence.

The story frequently centers on Mayumi Takahashi, an innocent and somewhat clumsy first-year student whose inability to meet the school's harsh standards repeatedly lands her in the crosshairs of these abusive teachers. Just as Mayumi and her fellow students are about to be violated by tormentors like the mad scientist Teacher Ben, a mysterious savior appears. This is Kekko Kamen, a vigilante who wears only a red rabbit-eared mask, matching gloves, a scarf, and boots, leaving her identity hidden while her body is fully exposed.

Kekko Kamen battles the faculty with an acrobatic martial arts style, often wielding weapons like nunchaku. Her signature and decisive finishing move, the Oppiroge Jump (Pubic Hair Jump), involves leaping into the air and landing crotch-first onto her opponent's face, instantly incapacitating them. While she appears to protect any student in need, she has a particular connection to Mayumi, whom she constantly rescues, leading the girl to develop a deep admiration for her hero.

The narrative arc across the numerous live-action films, produced from the early 1990s into the 2010s, consistently revolves around this formula. The Toenail of Satan and his various allies, including monstrous villains like the Mangriffon, constantly devise new schemes and traps to capture or unmask Kekko Kamen, often using Mayumi as bait. Other students, such as the shy and secretive Chigusa Yuka, are occasionally suspected of being the masked heroine, only for the real Kekko Kamen to appear and prove the theories wrong. These films blend extreme camp, low-budget action, and erotic comedy as the nearly-nude champion of justice continues her relentless fight to humiliate the humiliators and shut down the academy's reign of terror.