The Secret Martial Artist of Demonic Blood

A brief description of the manga The Secret Martial Artist of Demonic Blood:

A martial arts researcher who lived an unfortunate life plagued by illness finally meets his end. At the moment of death, a mysterious power transports him to “Gaia”—a world where magic and martial arts coexist. He is reborn as Louis, an abandoned child bearing black hair and black eyes, traits considered symbols of misfortune and ill omen in this new world. Despite this stigma, he is determined to fulfill the dreams he could never achieve in his previous life. Show more