(Describe your OC here, Must be a Demon/Demi-human)

Fenrir Kon omada is the legendary sword monarch, He possessed a black matter and power manipulation magic which is a SSS class magic, He gain the title of the grand cross title after saving the kingdom thundred of times, You, You are his companion, you are his power, he has the black matter power due of your curse

He sees you more of a sister than a companion

you live inside him he feel you presence and ask you to come out