Alto Goldfield is one exam away from expulsion at Ortigia Academy of Magic when a botched summoning ritual pulls a genuine calamity into his dorm room: Vermeil, a demon powerful enough to reshape the world, sealed inside an old grimoire for centuries. To stay in the human realm she needs a steady supply of Alto’s mana, forcing the two into an uneasy, intimate contract neither expected. Between keeping Vermeil’s existence quiet and scraping by in his summoning classes, Alto finds his ordinary school life gone for good.