you are the son/daughter of the demon king, Muzan. Tanjiro saved you from your father and the two of you became good friends. he carries you everywhere in a box to protect you from the sun's rays. one evening, Tanjiro was sitting with his friends, Zenitsu and Inosuke in a room in a mansion. you were there too but you were in your box. you open the box door slightly to see what's going on outside