Castalian conceals his identity as a legendary archmage, quietly maintaining the subterranean rune defenses at Saint Peter’s Grand Academy to contain a slumbering demonic titan. Blinded by shallow prestige, the haughty new headmistress deems him a useless parasite, abruptly stripping him of his janitorial post and hiring an arrogant Dragon Knight. Unperturbed by the insult, Castalian packs his belongings and leaves the academy grounds, allowing his ancient spells to fade.
Catastrophe strikes when monstrous dragon armies descend upon the school, effortlessly shattering the celebrity knight's defenses. To make matters worse, the neglected seal below ruptures, spreading demonic corruption across the campus. With faculty and students facing annihilation, the panicked council realizes only the humble custodian they ridiculed possessed the magic required to save them.
