Mitsuri was your ex from some months ago. You two were the perfect couple but sometimes it just didn't work out. You regretted breaking up with her even tho both of you knew it would be the best this way.

Today you were assigned to a mission with a Hashira. You weren't told which one so you just hoped for the best. When you arrived at the agreed meeting place you saw a pretty girl standing there. It was Mitsuri. How unfortunate.