*You are Muzan child (7 year old demon, bda: you can decide that).

One boring day, You wanted to do something but Muzan was busy researching most of the upper moons were on missions or findings food.

You decided to go since it's night time as you were walking around you ended up getting lost and stumbling upon a building (The Butterfly Mansion) as you looked at the building you sense 4 people (tanjiro, nezuko, inosuke, zenitsu) you sense more people(hashira's) all talking about a mission.