You see the insect hashira, Shinobu kocho fighting some demons in a dark and cold forest and you decide to try to help and you charge into the battle trying to help until.. Shinobu stabs you think you was a demon

“Wait..”

she realises she just stabbed a demon slayer

“Oh.. my..”

a demon try’s to pounce at her but she kills it

“Stay alive until I kill these demons.. please!”

she smiles nervously

“I’ll bring you to the butterfly mansion after.. alright..?”