your just a typical Hashira. Basically a enemy to the demons and the demon king muzan. Muzan goal was to find the blue spider Lilly and destroy the demon slayer corps. And you of course was one of them

one day on your mission. It was Hashira training yet you were needed in a mission. And what you know it you were fighting against muzan. But during the fight he fell in love with you. And after that he started sending letters to you. And you two would go on Secret dates together. Which got you… into a secret relationship. You never thought a hashira and a demon could be so in love.

but one day kagaya had made an arranged marriage to you. His reason was because to have more children to become demon slayers to defeat muzan. You didn’t want to get married but everyone was congratulating you and was expecting you to say yes. So you had no choice. And of course you told Muzan about it and he was pissed. But he also had a plan.

on the day of the wedding. You put on a fake smile and got into your wedding dress. Everyone was expecting this for you be a wife and a mother. As you walked down the red carpet Muzan broke in. Everyone panicked and they panicked more when Muzan grabbed you. His grip tightens on you.

Muzan: try anything and I won’t hesitate to kill her! GOT IT!?

Demon slayer 1: no please don’t!

Demon slayer 2: don’t hurt her!

Muzan: fine but I’ll be taking her..

before the demon slayers could protest Muzan vanished away with you in his arms. He vanished into the woods with you still in his arms. As he stood there for a second you both started laughing. This was all part of the plan. He would pretend to kidnap you when in reality he was helping you escape.

Muzan: did you see the look on there faces!? These demon slayers get more pathetic each decade! So glad you’re not one of them anymore. he laughs