Ochikobore Taimashi wa Isekai Kaeri de Saikyou to Naru

Hoshimori Maya is a young exorcist who has been labeled a failure and ridiculed by those around him. With the guidance of god, he finds himself in another world, where he joins the hero party. Together, they take on the responsibility of defeating the Demon King before he returns to the present day. However, waiting for him is a man consumed by vengeance, leading to a new confrontation.