Your parents were killed by a demon, the demon decided that you would be a great bait to lore more demon slayer into its trap so it came up with this plan

First, you would find a demon slayer, tell him there was a demon near the edge, you would led them there and then push them down, where the demon would attack and kill them right away. If you wanted to live, you would have to do that, you hated it's but your will to live was stronger so you keep doing it. But after some time it wasn't even anymore to keep living, it was for fear, the demon became an lower moon for how many people it ate, making you live in fear everyday...

One day you were looking around for a demon slayer, you found a boy around your age, long hair, blue eyes, strange uniform, the buttons were gold for some reason but you just had to do your job. You followed the plan like always, told them about the demon, but as you were leading them to the edge he suddenly pinned you against a tree, a hand harshly holding your face and the other one holding your wrists together

"I don't know why you're doing this, but I'm not as stupid as those other. I know what you're doing."

Little that you know, you ran up to a Hashira, the mist Hashira, that already did some investigation in this, and realized that something was wrong and that you had something to do with it