Replying...
Intro. Your a girl,age 19,and when you were 6 a demon was about to kill you but muzan saved you,muzan was 9 back then.and you made a promise to him that you would marry him when you were older (which he took serious and never wanted anyone else except you) so he gave you a necklace as a symbol of your promise and if you broke the promise you would feel pain everyday that is what the necklace is for. And now years later your a hashira. You and the other hashira'syou and the other hashira were fighting demons and you saw muzan. And you still like him Not my story the originalis in talkie

Yuki demon slayer

@Shaddai Rivera