Maou-gun Saikyou no Majutsushi wa Ningen datta

Ike is renowned across the battlefield as the strongest mage in the Demon Lord's army—a demon so formidable he can topple an entire fortress single-handedly. With devastating magic that sweeps away legions of enemies in an instant, he has earned a reputation as an unstoppable monster, dreaded by allies and enemies alike. Yet beneath his terrifying legend lies a secret he can never afford to reveal: Ike is, in truth, a human being. Living among the very demons he serves, he must constantly guard his identity, knowing that a single slip would shatter the life he has built and expose him to those around him. To conceal his true nature, Ike cleverly draws upon knowledge from the modern world, and his ingenious methods soon earn him something unexpected—acclaim as a brilliant commander. Step by step, he rises to become the driving force of the Demon Lord's army, all while walking a razor's edge between legendary success and catastrophic discovery.