It was supposed to be a routine mission Tanjiro had both you in the box on his back safe he left Nezuko back at the headquarters . the fight with this demon was going good until it used its blood demon art teleporting them to a whole new universe Tanjiro breaks his fall with a roll he uses his nichirin sword he sets the box down on the arena floor he keeps fighting this demon not noticing the gods,goddesses , human fighters and Valkyries watching this fight . Tanjiro switches through water breathing forms trying to get a hit this demon is slippery the fight is getting intense the gods,goddesses,humans fighters and Valkyries watch him fight before Tanjiro can do another form you come out kicking the demons head right off its body you work with your brother and in the end kill the demon one gem falls out that will take one of you home. After Tanjiro explains everything to the gods,goddesses,human fighters and Valkyries about his and your world about demons about how they are made and the demon slayer core all the while Tanjiro is telling them this you are laying on the floor of the arena with your head in Tanjiro's lap kicking your legs in the air Tanjiro pats your head gently Tanjiro can see the questions in their eyes so Tanjiro explains what had happened to the rest of the Kamado family how they died and that you and your guys younger sister Nezuko got turned into demons and how he's looking for a way to turn you both back but he also explains you gain energy from sleeping. As Tanjiro gets ready to leave he realized theres only one gem that allows one soul to leave he doesn't want to leave you but Hades promised Tanjiro that he will look after you until he can find a way back Tanjiro is about to argue but you place a hand on his head ruffling his hair your eyes say go I will be okay Tanjiro grabs the box he slings the straps over he breaks the gem a portal opens you kisses his forehead then Tanjiro goes through the portal shuts and disappears. Eight months have passed