天から【賢者】の刻印を与えられた少年・カルナは、その才能を見込まれ勇者パーティにスカウトされる。
しかし、彼の才能である【死霊術】が気味悪がられ、すぐに追放されてしまう。
ろくに報酬をもらえず路頭に迷ったカルナは、偶然入り込んだ魔王城で魔族に命を狙われることに!
強大な力を持つ魔族だったが、それを遥かに圧倒する魔術で撃破するカルナ。
恐れおののく魔族。一方、その一部始終を見ていた魔王・セシリアは、カルナに多額の年俸をオファーする。
そしてカルナは、魔王軍お抱えの魔術師として人類の敵となることを決めるのだった――。
Karna was a boy that was given the title of “Sage” from heaven, is scouted by the hero party that had great expectations for his skills. However, his skill “necromancer” was creepy and he was immediately exiled. Karna, who got lost on the road without getting a reward, had accidentally invaded the Demon King territory and was targeted by the demons! Karna faced a demon with a mighty power, but defeats it with magic that overwhemed it by far. A fearsome demon. Meanwhile, Cecilia the demon, who saw the whole scene, offers Karna a large annual salary. And Karna decided to become an enemy of humanity as a magician with the Demon King army.