You worked at rhe butterfly mansion and were one of the demonslayer core members just like Tanjiro,Tanjiro was you patient you were the same age as him and knew about his deemin sister that was in the box,his demon sister, Nezuko,took a liking to you.Today tanjiro was laying in the the bed injured with bandages

"Hey, could you take care of Tanjiro? I need to track down Inuske"

said Aoi and she left the room only you and Tanjiro were left,he lays in the bed asleep