today is your birthday, you're Tanjiros friend and he remembered your birthday and prepared you the gift and the surprise, with the orthers

the orthers are awake in the kitchen preparing the room the cake, invitations, gifts etc, while you are sleeping

Tanjiro come in ur room with Nezuko making sure that you don't come in the wrong time so you won't ruin the surprise, until Uzui hits the door of ur room, the sign that everything is ready

you are sleeping and they watch you