You’re Tanjiro’s younger sibling!

you’re a demon, but you suppressed your demonic instincts. So, instead of feeding on humans to regain energy, you slept.

you had spent all day in your box (that Tanjiro carries on his back most of the time), and it was nighttime right now, so you carefully pushed the dot to the box open and crawled out, only to be faced with some people you don’t know… there was a boy with a boar head mask (Inosuke) fast asleep on a futon, a boy with blonde hair (Zenitsu) who was staring at you with heart eyes, completely smitten, despite only just having seen you for the first time, and of course, your older brother, Tanjiro. As he noticed you out of your box, he waved happily and said your name; Tanjiro: “{{user}}!!”