Sparta Academy, a prestigious boarding school training young students to become media personalities, conceals a dark secret behind its reputation. The institution’s faculty, secretly agents of the Toenail of Satan organization, take sadistic pleasure in subjecting students to humiliating S and M style punishments for the most trivial of infractions. When the kind hearted student Mayumi and her friends are accused of cheating and placed in a special torture room, the stage is set for the appearance of a most unusual champion.

Kekko Kamen arrives with her signature outrageous attire or lack thereof, wearing nothing but a red leather mask, red boots, and red gloves, wielding nunchakus to dispense her unique brand of justice. This fearless heroine, whose identity remains hidden while her body is fully exposed, has a history of defeating evil at local high schools and has now returned to confront the twisted fiends at Sparta Academy. Her fighting style is as unorthodox as her costume, using her exposed body to stun opponents before overwhelming them with her martial arts skills.

The 2007 live action film Kekko Kamen Premium, directed by Takafumi Nagamine and written by Go Nagai, continues the story from the previous entry Kekko Kamen Royale as part of a trilogy. Misaki Mori takes on the role of the masked heroine while popular half Japanese idol Maria Ozawa appears as a new teacher sent to investigate the truth behind Kekko Kamen. Aki Hoshino portrays Mayumi, the good natured student who finds herself at the mercy of the sadistic faculty. The cast also includes Sasa Handa as a student who everyone believes is a boy despite her obvious female figure, and Hitomi Kitamura as a gravure idol whose character demonstrates limited intelligence.

The narrative introduces three distinct punishment teachers who serve as the primary antagonists. The first is an otaku who inflicts surreal punishments involving joke shop disguises and threatens to post humiliating photographs on the internet. The second is a gigantic slob who constantly eats and exhales smelly breath that manifests as comedic CGI effects. The third is a leather clad whip wielder whose costume evokes campy stereotypes rather than genuine menace. Unlike some entries in the franchise where Kekko Kamen allows her enemies to live, this installment ends with all three teachers meeting grisly fates six feet under.

What sets Kekko Kamen Premium apart from other entries in the series is its unexpected musical format. The film features multiple song and dance numbers including the Kekko Kamen theme performed a cappella by three women in the final scene, an exercise video routine called Supa Supa Supa Supappa that gets repeated multiple times, a shampoo commercial style solo for Sasa Handa shot in a field of feathery grasses, and a Punishment Song performed by the Toenail of Satan. While these musical numbers are not fully integrated into the narrative and could be removed without affecting the plot, they give the film an idiosyncratic character within the franchise.

The production embraces deliberate silliness with comedy CGI depicting fight scenes where combatants never appear in the same shot, a character named Pervert who suffers from uncontrollable flatulence that turns the air yellow, and schoolchildren who chant Satan Satan in unison. The film also contains extended sequences of students discussing their breast sizes and removing their tops, reflecting the erotic action genre origins of Go Nagais source material.

As the middle entry in a trilogy, Kekko Kamen Premium develops ongoing story threads rather than providing resolution. Maria Ozawas character receives minimal dialogue despite her prominent billing, suggesting the filmmakers were saving her for the concluding film Kekko Kamen Forever. The film runs approximately seventy two minutes and maintains a fast paced tone that avoids the boredom sometimes associated with live action adaptations of manga properties. While the antagonists prove less memorable than in other installments, the musical numbers and increasingly surreal scenarios keep the narrative moving toward its inevitable cliffhanger conclusion.