The Demon Lords Apostle is the true hero

A class is transported to another world by a goddess, given level-up systems, and assigned heroic classes through a sacred orb. When the exiled classmate receives the class Demon Lord Apostle, the goddess, his classmates, and the holy city condemn him to die in the world's worst region. Then the demon lord contacts him, beginning his journey as the story's supposed villain, or perhaps its real hero.