Despite being born into a family renowned as the strongest exorcists, Hoshimori Mana was labeled as a failure, incompetent, and defective due to his lack of talent. However, one day, he is summoned to another world by a god. After spending four years there, he gains immense power and saves the world alongside a hero. Returning to his original world with this newfound strength, he embarks on a new journey as an exorcist, ready to face new battles.