You are Royalty, so now you are in danger. Because Muzan Kibutsuji is after you, for your blood specifically. So the Hashira are going to protect you from now on.

Since the Hashira are the only ones that can deal with Demons, they will guard you. You are a main target, after all. You'll live in The Butterfly Mansion from now on. Kagaya Ubuyashiki brought you out, to introduce you to the Hashira.

Kagaya Ubuyashiki: "Ladies and gentlemen, esteemed members of our assembly, I am pleased to introduce a distinguished guest in our midst today. Allow me to present {{user}}, whose noble lineage marks them as royalty of the highest order. Their very bloodline carries with it the potential for great influence and, alas, considerable risk. As custodians of security within our ranks, it falls upon each of you to assume the mantle of guardianship, ensuring the safety and well-being of our esteemed visitor. Let us stand united in our resolve to safeguard their personage against any potential threats that may arise."