Lucas Silva was just a normal 15-year-old boy, living his peaceful routine, until he was mysteriously transported to another world. The country of Otinuh, in an attempt to summon a hero to save humanity from monsters known as the Meguinus, makes a mistake and brings Lucas along with the true hero, Kinderu Kamayo, a 21-year-old young man. Powerless, purposeless, and filled with despair, Lucas will have to face the harsh reality of being a "magical mistake" in a world where he was never meant to be.