Maou Gun Saikyou no Majutsushi wa Ningen datta | Episode 6

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Ike is a powerful magician and the leader of the Immortal Brigade, part of the Seventh Corps of the Demon Lord’s Army. He single-handedly conquers fortresses and pushes back the armies of humanity. Neither Dairokuten, the Demon Lord, nor Ike’s loyal soldiers know his darkest secret—he is a human in hiding! But can he keep his secret safe and bring peaceful coexistence to demons and humans?

(Source: Crunchyroll)