Kinsou no Vermeil: Gakeppuchi Majutsushi wa Saikyou no Yakusai to Mahou Sekai wo Tsukisusumu

Alto Goldfield excels in most of his studies at Ortigia Academy of Magic, yet his repeated failure to summon a familiar threatens to make him repeat the year. As a last resort, he follows an old grimoire and finally succeeds, only to summon something far beyond an ordinary magical creature: Vermeil, an immensely powerful demon who had been sealed away. She agrees to become his familiar and seals their contract with a kiss.

From that moment, Alto's greatest weakness becomes both an extraordinary source of power and a secret that is difficult to hide. Vermeil is playful and bold, but her name and strength inspire fear. As rivalries within the magical world intensify, Alto begins to realize that their bond may pull him into dangers far greater than failing a class.