At Ortigia Magic Academy, Alto Goldfield is a brilliant student facing academic ruin. Despite his profound theoretical knowledge of magic, he has repeatedly failed to summon a familiar, the mandatory
rite of passage required to advance to his second year. Desperate and unwilling to give up his dream of becoming a master sorcerer, Alto discovers a dusty, forbidden grimoire. Following its cryptic instructions, he draws a complex magic circle and offers his own mana as a catalyst, successfully summoning a familiar. However, the entity that emerges from the summoning circle is not a standard magical beast, but a breathtakingly beautiful and voluptuous woman named Vermeil.Vermeil reveals herself to be an ancient, legendary arch-devil who has been sealed away in the grimoire for centuries, possessing immense, cataclysmic power capable of destroying nations. Grateful for her release, Vermeil binds herself to Alto through a passionate kiss, which also establishes a unique pact: to maintain her physical form and immense powers in the human world, she must regularly replenish her magical energy through physical intimacy with Alto, usually by kissing him. This dynamic immediately complicates Alto’s academic and personal life, especially since Vermeil is fiercely protective, unapologetically seductive, and fiercely devoted to him.Their unusual partnership instantly draws suspicion and jealousy, particularly from Lilia Kudelfein, Alto’s childhood friend and a talented
student council member who harbors deep romantic feelings for him. As Alto and Vermeil navigate academy life, they quickly become targets. Alto’s unprecedented magical output attracts the envy of his peers, while darker forces within and outside the academy take notice of Vermeil’s true demonic identity. The tranquility of the school is shattered when rogue mages and corrupted faculty members attempt to capture Vermeil, seeking to harness her destructive devilish power for their own malicious ambitions.Throughout these escalating conflicts, Alto refuses to treat Vermeil merely as a tool or a weapon, viewing her instead as an essential partner. In return, Vermeil grows genuinely attached to Alto, often pushing her own limits to protect him from deadly threats. As they face increasingly powerful adversaries, including remnants of divine beings and rival demons seeking to reclaim or destroy her, the stakes rise from mere academic survival to a massive war. Alto and Vermeil must combine his strategic intellect with her overwhelming devilish might, forging an unbreakable bond of trust, love, and sheer survival against a world determined to tear them apart.