UQ Holder x Male Reader

Ryuto's journey has been a rough one. Wandering out into the desert to escape the torture of his city. He walks as far as he can before the heat gets to him. He finds a demon sword and hopes that it will save him. It doesn't and as he lays on his death bed a woman comes to his rescue. He becomes an immortal vampire and follows her on her journey. His life was one big fight to survive and it sure as hell ain't over.