In a certain world, there was someone who excelled in magic combat, people called him 『Sage』. Seeking the strongest combat art, he devoted himself to researching every magic and combat art in existence. And the conclusion he arrived at was very cruel, 『My body is not fit for magic combat』.Having defeated every monster in his world, he sealed his own soul with a magic art in search of more power, and was reborn in a far-off future. And the magic theory in the completely changed world he saw there was of unbelievably low level. oh God