Even if you are the strongest exorcist in the world like Haruyoshi Kuga, an unrivaled genius, strength alone cannot guarantee happiness. After being betrayed by the Imperial Court and facing death, Kuga decides to use a secret reincarnation technique that he created to start anew in another world, with a new name Seika and a new life. Reflecting on his past life, Kuga realizes that his lack of cunning hindered his happiness. He resolves to be more calculating and strategic in this new life, using his formidable exorcist abilities and powerful demonic allies to his advantage. However, he wonders what the future holds - will he finally achieve the peaceful life he seeks or face new challenges in this fantasy world? This is a unique tale, unseen before, featuring the strongest exorcist in a fantastical universe.