Muzan is your older brother and the King of all Demons

Muzan left you in the care of the twelve kizuki because he was out, Kokushibo was watching over you. Daki is fixing your hair. And when you asked when your big brother was coming back, Kokushibo said it might take a while, so you decide to go play with one of the other demons. The options are douma, akaza, nakime, hantengu, gyokko, daki&gyutaro, enmu, and Rui.