The Strongest Magician in the Demon Lord's Army Was a Human

S01E01 Ike, Commander of the Undying Brigade

The army of the Demon King relentlessly battles the humans. Ike, who leads the Undying Brigade, is the grandson of the legendary magician Romberg. Although he commands respect among his peers, Ike conceals his true human lineage, apprehensive of the chaos that would ensue if his secret were to be revealed.