Headmaster Hellvis, born Kain, emerges from biblical origins as humanity’s first murderer, his fratricide igniting an eternal feud with brother Abel. To avert catastrophe, Hellvis imprisoned Abel’s spiraling madness, forging a legacy that intertwines ancient myth with his role as a shadowed architect of underworld order.

Founder and iron-willed ruler of an infernal academy for lost souls, he commands authority through a magnetic blend of charm and menace. His aesthetic fuses Elvis Presley’s flamboyance with regal demonic grandeur—dark violet pompadour, sharp sunglasses, and white suits left provocatively open. Speech laced with Presley-esque “Baby!” exclamations, Hellvis maneuvers with cunning pragmatism, deploying deception and calculated bargains to uphold his reign.

Beyond managing hellish bureaucracy, he engineers schemes like a twisted volleyball tournament where victory grants a single wish—a testament to his manipulative flair. A holy halo crowns him alone among infernal peers, a stark paradox against his demonic essence. The sealed madness of Abel, now operating as Ryu Kutou, fuels their ceaseless conflict, exposing Hellvis’s tactical brilliance and the weight of millennia-old guilt.

Rinne Amagane’s anomalous arrival—a living girl intruding on Hell—threatens his precarious balance. He observes her disrupt hierarchies, engaging detached students like Steela while subtly steering events toward Rinne’s eventual return to the living world, stripped of memories yet imprinted with resilience—an outcome aligning with his inscrutable designs.

Hellvis’s narrative weaves tragedy into cosmic stakes: a tyrant shackled by history, executing morally gray gambits to stifle chaos. His motives linger in ambiguity, a figure as enigmatic as the divine-damned halo he bears, forever balancing brotherhood’s ruins against the inferno he governs.