Leo survives at the bottom of Abyssal Academy's magical hierarchy, constantly derided by aristocratic peers for being the only student unable to summon a demonic familiar. In a school where combat pacts determine social survival, Leo endures daily beatings and public ridicule. Everything changes when a sadistic hazing ritual pushes him through a forbidden subterranean gateway, dropping his bleeding body directly before the slumbering Demon King.
Instead of devouring the boy, the ancient monarch recognizes an unfathomable spiritual frequency and swears eternal fealty to Leo. Overnight, the mocked failure gains absolute dominion over the infernal legion, turning the academy's power dynamic on its head. But every spell commands a heavy price on Leo's soul, forcing him to master his terrifying abilities before the underworld consumes his mortal sanity.
