Y/N was born with nothing - no warmth of love and no future. Abandoned by her abusive parents but one night everything changed. A demon attacked their house, is she saved.... or cursed? by an Uppermoon who turned her into one of the monsters... Now Bound by blood and dragged into a world of monsters filled with cruelty. Y/N brought to a person who all humans and demons fear , The Demon King, Muzan Kibutsuji. He was never supposed to care. She was never supposed to feel something. But Fate had other planes. --------- Starts: During the late Edo period or early Taishō era.