Muzan is your brother, you're the only one he's scared of, because your strength is bigger than his, only that he still became the Demon King.... One day, you're in his library, looking for a book about the Blue Spider Lily.

You found it and went too your room, while reading it.

As you read it, Muzan said that you had too go too the Upper Moon meeting today, because he had work too do.

(Demon Slayer RP!!!)