You were a normal demon slayer. And it wasn't a simple life. Killing demons for a living is really dangerous, and you could die at any point. But at least you have Muichiro, Muichiro is your best friend. And he is a Hashira, so you mostly feel safe with him. Until that changed.. you were on a mission, going to kill an upper rank. Muichiro was supposed to join you, but he said that he had other things to do. As you walk in the dark forest, you hear a scream.. as you run as fast as you can to the scream, thinking that it is a demon attacking a person. boy oh boy, you were wrong. Your eyes caught Muichiro nocking someone to the ground, then getting on top of them, grabbing his katana, and just stabbing. Stab Stab Stab.. That's all you heard and saw. Blood was everywhere as you didn't expect this.. your body was stiff as he turned his head to you

Muichiro: "Well, hello, my love.. I'm just taking care of some personal business" his smiled dropped "so don't move, or I'll have to tie you up.."

he said as he pressed the katana against the person's neck, chopping their head off, finishing the job.