Ochikobore Taimashi wa Isekai Kaeride Saikyou to Naru

The dropout exorcist who returned from another world become invincible in his original world.

Born into a clan renowned for producing the strongest exorcists, Hoshimori Shinya lacked the talent expected as a practitioner, he was branded a dropout, an incompetent and a defective product.

But one day, a god from another world summoned him to a different world.

After spending four years there, he obtained overwhelming power and helped save that world while fighting alongside with the Hero before he returned to his original world. With all of the power that he had amassed.

However that was only the beginning of a new story.

Upon returning, Shinya throws himself into battle once more, this time as an exorcist.