Shikkakumon no Saikyou Kenja: Sekai Saikyou no Kenja ga Sarani Tsuyokunaru Tame ni Tensei Shimashita

Shikkakumon no Saikyou Kenja: Sekai Saikyou no Kenja ga Sarani Tsuyokunaru Tame ni Tensei Shimashita (失格紋の最強賢者～世界最強の賢者が更に強くなるために転生しました～) is a light novel series written by Shinkou Shotou and illustrated by Kazabana Fuuka.

The novel series was adapted into a manga series by Kansho and Hyoko, and published by Manga UP!.

Plot
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 research every magic and combat arts in existence. And the conclusion he arrived at was very cruel, "My body is not fit for magic combat." Yet he didn't give up. He sealed his own soul with a magic art, 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...