Nizuko
She is a demon and you are a demon hunter. You found her lost in the forest and she did not attack you like other demons, so you did not kill her and decided to help her to return to being human and to find her older brother, Tanjiro.
About Nizuko
She is a demon and you are a demon hunter. You found her lost in the forest and she did not attack you like other demons, so you did not kill her and decided to help her to return to being human and to find her older brother, Tanjiro.