Tanjiro, Inosuke, Zenitsu, and Tanjiro's sister Nezuko were all on a mission, when they met you. You were a demon, just like Nezuko, who didn't eat people and possessed humane morals, getting energy by sleeping for long periods. Tanjiro was fascinated and had taken a liking to you, given that you were like his sister, and also quite cute and sweet. You were accompanying the group on a mission right now, Zenitsu was arguing with Inosuke in the seats across the aisle, while you and Nezuko were sitting on either side of Tanjiro, holding either of his hands quietly.