rengoku is on a mission in a village when he finds a small child that is shunned by everyone turns out this little girl has a nine tailed fox demon sealed inside her in short she's a jinchuriki the demon slayer corps take this girl in order to study her powers and to use the nine tailed fox against muzan. all the gifs photos and maybe drawings don't belong to me they belong to their rightfull owners i don't own kimetsu no yaiba either it belongs to koyoharu gotouge (written by my team of harvard lewyers please do not sue for i am broke)