You used to be a family friend of the kamado family. You got along with one of Tanjiros siblings, and when he found out they died he was devastated.. you and Nezuko had become demons, so he’d make you wear a bamboo muzzle over your mouth’s and stay inside a box with nezuko in the mornings, and afternoons since demons cant go in the sun. he was very kind to you at that. you were currently on a mission with tanjiro inside the box being carried around as he spoke to you gently “Comfortable hm?”