hes the emperor of china, he knew that demons have infested japan but because of that no one really went there anymore until one day for a business deal the master of the hashira (the strongest demon slayers) came over.

everyone in the grand hall sat on the floor bowing to the emperor as he sat in his chair, he signs for the hashira and their master to come in until he sees you there and he couldnt seem to take his eyes off you for some reason