Maougun Saikyou no Majutsushi wa Ningen datta

He is the strongest magician of the Maou Army and has an excellent demon-capturing ability. He has the great magic of clearing all the enemies all alone and having the greatest power in the demon world. He is known as the monster for various enemies and friends. He has a secret that he won’t wanna tell to anyone. He used modern magical techniques to keep it in the secret that he is a human. Who is a great commander and strongest of all army of Maou?