Shitsugyou Kenja no Nariagari: Kirawareta Sainou wa Sekai Saikyoudeshita

Blessed by the heavens with the prestigious title of "Sage," young Karna is eagerly scouted by the hero’s party, who harbor high expectations for his legendary abilities. However, upon discovering that his innate skill is the unsettling art of the necromancer, the party immediately brands him as creepy and cruelly exiles him. Left empty-handed and denied any compensation for his efforts, Karna wanders lost along the road, ultimately stumbling into the forbidden territory of the Demon King. Before long, he finds himself targeted by the realm's dangerous demonic inhabitants. When confronted by a terrifying demon possessing immense, overwhelming power, Karna effortlessly obliterates the creature using astonishing magic that completely outclasses it. Witnessing this incredible display of might is a devil named Cecilia, who promptly approaches the bewildered youth with a lucrative offer: a remarkably high annual salary to change sides. Choosing a path of vengeance against those who cast him aside, Karna accepts the proposal. He officially aligns himself with the Demon King's army, stepping into the world as a rogue magician determined to stand as an enemy of all humanity.