A commoner girl who, like Seika, came to take the entrance exam for Rodnaire Academy of Magic. She has magical aptitude for all attributes, and she has an amazing talent for swords and magic, topping the entrance exam. Because of her ability, it is rumored that she is a "hero" who can defeat the Demon King.
~!She is also the hero who is destined to be protected by the Demon king!~
~!She also looks like Haruyosh's deciple who killed him!~

You can't be happy if you're just strong, even if you're the strongest exorcist in the world. 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.
 
"What I lacked in my previous life was cunning. In this life, I'll be more calculating and find happiness." With the strongest exorcist techniques and strong demons working with him, what lies ahead for him? The peaceful life he wants, or.... This is the start of a story no one's ever seen before: the story of the strongest exorcist in a fantasy world. 

(Source: Crunchyroll)

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Haruyoshi Kuga's power as the strongest exorcist is all for naught when he is betrayed by his closest ally. With his dying breath, he casts the secret Spell of Reincarnation—when he next opens his eyes, he finds himself in a different world altogether, reincarnated as Seika Lamprogue, the son of a family of magic scholars!
 
He quickly learns that the magic in this new world is quite unlike the sorcery he learned in his past life and that he can't use it. Fortunately for him, with his mastery of curses and the hordes of youkai at his disposal, he doesn't need to.
 
Haruyoshi (now Seika) is determined not to repeat his past mistakes in his second life by smartly laying low and avoiding flaunting his power. Yet accomplishing his goals and without drawing attention to himself proves to be easier said than done—will his powers be enough to live a happy life?!
 
(Source: J-Novel Club)

Betrayed by his allies and on the verge of death, the strongest exorcist, Haruyoshi Kuga, desired only one thing—to be happy in his next life. Using the secret art of reincarnation, he was transported to another world. Reborn as Seika Lamprogue, third son of a distinguished family of magic scholars, he's found to have no magical power whatsoever, which is an unacceptable shame in a family of mages.
 
However, he soon comes to realize that his new world's magic is nothing compared to the sorcery he mastered as an exorcist. With his control over divination, curses, and legions of youkai who serve him, his life in this new world should be a breeze! The only question is: how can he make use of those powers while laying low to avoid another untimely demise?
 
(Source: J-Novel Club)
 
Note
- This Series has been published on M Novels Imprint and later has been published as Monster Bunko Imprint with new written adjustment and new Illustrator

Mini anime of Saikyou Onmyouji no Isekai Tenseiki shorts posted on the official Twitter.

Amyu