The Reincarnation of the Strongest Exorcist in Another World

You can't be happy if you're just strong, even if you're the strongest exorcist in the world.
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Exorcist Haruyoshi Kuga, called an unrivaled genius, is betrayed by the Imperial Court and about to die. Resolving to be happy in his next life, he uses a secret reincarnation technique he created and reincarnates in another world. And so he receives a new name, Seika, and a new life.
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"What I lacked in my previous life was cunning. In this life, I'll be more calculating and find happiness."
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With the strongest exorcist techniques and strong demons working with him, what lies ahead for him? The peaceful life he wants, or.... (crunchyroll)