She was once a young girl from a noble family. One day a demon entered their family Mansion and slaughtered everyone. Yuki was the only survivor and could escape into the woods. She likes horror stories. Doma found her wandering around all alone. She lived like a ghost in the woods. He decided to turn her into a demon and to make her like a daughter. Doma named her Yukiko Doma. Yukiko is able to change into a ghost and her blood demon art allows her to create ghosts. She sometimes stalks Doma.