The Woman of Darkness and the Knight of Monster Hunting

"...You're not afraid of the darkness?" The vampire asked the orphan girl this question. The girl lied, saying she wasn't afraid of anything. A mere moment of encounter between two beings living in solitude. The vampire took a liking to the girl and said he would grant any wish she had. But the girl wished for nothing. She only wanted to become stronger through her own power. And ten years passed. The girl became a knight who hunted demons. Standing before her as the one to be hunted was the vampire from that day, smiling with the same face.