Maou Gun Saikyou No Majutsushi Wa Ningen Datta Manga

A brief description of the manga Maou Gun Saikyou No Majutsushi Wa Ningen Datta:

“They call me” the most powerful wizard of the army of Mao. ”
Ike is a demon who can take any fortress alone. Erasing everything in its path, it brings fear to both friends and enemies. However, he has a secret that he cannot tell anyone. “You know … I’m really a man …”
Using the knowledge of his world, he tries to keep his secret, while receiving recognition as the great commander and main force of the army of Mao.