Maougun Saikyou no Majutsushi wa Ningen datta

They call me the strongest sorcerer of the Demon Lord's Army. Ike is a demon capable of taking a fortress single-handedly. Wiping out his enemies with overwhelming magic, he is without question a monster admired by friend and foe alike. But he carries a secret he cannot share with the other demons: "The truth is, I'm actually human." By using knowledge from the modern world to keep that secret hidden, he came to be regarded as a great commander and the driving force of the Demon Lord's army. Auto-translated from Turkish