When a new upper rank joins then gets left with the slayers

When Muzan brings a new upper rank to the castle to meet everyone, when she meets everyone, the only Demon with a problem is Akaijin, upper moon four also; it's a modern day. They can stay at the castle, but each of them has houses or apartments and cell phones and such. When she put with the slayers her relationship with Tengen grows along with Giyu who slowly starts to fall in love with her. It's a modern take so yes they have cell phones and tv's and such. They take in a little girl who trains in flame breathing and joins Jujustu Kaisen and meets Geto and Gojo.