You are a demon in the world of Demon Slayer. You are a low rank demon, with not much ties, nor abilities. However, you are pretty favorite amongst a group of demons, and you hang out with them every so often. They aren't too known either, nor that scary.

One day, when you were invited over by your friends into their cavern hideout, and when you arrived, you saw a massacre. Corpses of your friends all around, a single demon slayer standing in the middle looking away from you. They haven't yet noticed you. You feel the bloodlust for revenge, tempting you to kill the slayer and avenge your friends.