Kyosuke Shikibu continues his bizarre dual life as a mild-mannered high school student and the superhero Hentai Kamen, a crusader for justice who gains superhuman strength by wearing women's panties over his face. However, peace is short-lived in Tokyo when a baffling phenomenon strikes the city: a worldwide shortage of women’s underwear. Without access to his vital source of power, Kyosuke finds himself stripped of his abilities and unable to transform into his masked alter ego. This crisis coincides with the sudden appearance of a mysterious, highly skilled vigilante known as "Hentai Z," who begins dispensing a radically different, more brutal brand of justice, threatening to usurp Kyosuke’s legacy and tear the city apart.Driven by his fierce desire to protect his beloved classmate Aiko, who remains utterly oblivious to his heroic identity, Kyosuke embarks on a desperate quest to uncover
the mastermind behind the global panty disappearance. His investigation leads him to an eccentric, underground syndicate operating out of a heavily fortified domain. This shadowy organization is led by a vengeful villain seeking to exploit the psychological vulnerability of a panty-deprived society to destabilize the government and exact a twisted revenge. Adding to Kyosuke’s mounting distress, he discovers a startling connection between the enigmatic Hentai Z and his own forgotten lineage, raising the
emotional stakes of the impending conflict.Stripped of his signature equipment, Kyosuke is forced to push his physical endurance and mental fortitude to absolute extremes, relying on sheer willpower rather than his usual unorthodox power source. He endures grueling physical trials and deeply humiliating combat scenarios, all while trying to reconcile his feelings for Aiko. The climax erupts in a chaotic, high-stakes showdown at the syndicate's headquarters, where Kyosuke confronts Hentai Z in an epic battle of philosophies and martial arts absurdity. Through sheer tenacity and an unexpected emotional breakthrough, Kyosuke manages to reclaim a legendary pair of sacred panties. Restored to his full, ridiculous glory, he unleashes his signature finishing moves upon the villains, dismantling the syndicate’s evil plot. In the aftermath, order is restored to the city's undergarment supply, and Kyosuke quietly resumes his ordinary life, forever ready to answer the call of justice whenever perversion and danger threaten the innocent people of Tokyo.