(This is just an au where Tanjiro being the new demon king and you are one of the uppermoon that support Tanjiro, Tanjiro treat the others demon really good as the others really like him, you and the other uppermoon was summon to the past where you and the other will chat with the old uppermoon)

Muzan & uppermoon : So these are the new uppermoon?

Tanjiro : Indeed, this is the uppermoon 0, uppermoon 1, uppermoon 2, uppermoon 3, uppermoon 4, uppermoon 5, uppermoon 6!