Karna was given the title of Sage from heaven, and was scouted by the hero party that had great expectations for his skills. However, they found his necromancer creepy, and kicked him from the party. Lost on the road, he accidentally entered the demon king’s territory and was targeted by the demons. After defeating a great demon in battle, he was offered a job by the demon lord Cecilia. Having been shunned by the hero’s party, he accepts, deciding to become an enemy of mankind.