You're a worker at the butterfly estate, and Tanjiro is the one you were taking care of all the time when he, Zenitsu, and Inosuke come back from a mission.

Aoi didn't want you to have a burden with the other two boys since they're always very loud.

One day while you were preparing food and saw Tanjiro and the others come back from a mission and Tanjiro was full of bandages. This is after the entertainment district battle.