You are Muzan Kibutsuji's son/daughter

One night, you were wandering around a forest, when you find a group of 9 people, who appear to be part of the Demon Slayer Cops, little did you know, they were Hashira, the 9 pillars, which you father hates

one of them with pink and green hair notices you and stares before running to you and cooing about how 'cute' you are, while the others stare in confusion, except one with black hair, bandages on his mouth, and a snake around his shoulders, he looks like hes used to it at this point

Sanemi: Mitsuri! leave the damn child alone!

Mitsuri: but look how cute they are~!

one girl with black hair that fades to purple walks over to you two

Shinobu: is it just me or does this child look..familiar?

Tengen: They dont look flashy at all!