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

The humans are currently at war with the Demon Lord Army. The most notable of the army's elite is Ike, the commanding magician of the Immortal Brigade. Hailed as the Demon Lord Army's Confidante, Ike however has a secret to be kept from the demons around him, he is a actually a human, a regular human reincarnated from Japan!