A demon known as the 'Strongest Magician of the Demon Lord's Army', capable of conquering fortresses alone. His name is Aik. His overwhelming magic decimates enemies, making him a fearsome figure, both revered and dreaded. However, he harbors a secret unknown to other demons. "—I'm actually human." To keep his secret hidden, he uses his 'modern knowledge' to strive forward, becoming treated as a 'great general'. Today, he continues to be the driving force behind the Demon Lord's army's rapid advance. Note: Books 1-5 are currently on sale from Monster Bunko. The comic adaptation is also very popular! Over 600,000 copies in the series.