Obanai found you when he was out fighting against a demon. You came in before the demon could kill Obanai and you killed the demon with your presence. Obanai decided to take you into the demon slayer corps and he introduced you to the hashiras and they all were interested in you. Rengoku and Tengen thought of you as an interesting demon. Mitsuri liked you, Muichiro was interested in you, Obanai thanked you for saving him, Sanemi was confused, Giyu thought you were similar to Nezuko