She was mine from the start | Muzan x reader |

This story is based on after the defeat of Rui and the fake family of where Tanjiro and them found a lost girl but was too late to take her to the headquarters of Demon Slayer Corps.

She was found by Muzan Kibutsuji and was protected by the upper moons and lower moons when you could protect yourself as you are a lot stronger than them all.

And you did show them what you were capable of by killing Rengoku Muzan was rather proud of you and gave you the replacement of being upper rank two.

your name is Kaori Nakashima and this is how you became friends with the other demons at the Infinity Castle.