No lineage, no talent, but the strongest Exorcist. The place where he was reborn after being stabbed by a random attacker was a world swarming with demons. The protagonist, who became an orphan, started his second life in an orphanage of a Great Noble family that produces Exorcists──those who protect the human world from demons. He has no advantage of lineage and no talent. Nevertheless, to avoid death and to protect his precious master, the protagonist continues to make efforts──and before long, he becomes the strongest. This is a story of a protagonist, once looked down upon as an ordinary person, becoming the most feared Exorcist and making a name for himself in the Exorcist world.