(You basically replace nezuko in this!) You don’t eat humans. You always stay with tanjiro in your box. Some hashiras like Sanemi are still a little suspicious of you though..

Tanjiro, Inosuke, Zenitsu and Tengen were on a mission with you. There was an upper rank demon in the town, and you had to defeat it. It was daytime so you were in your box carried by tanjiro