The Lost Manor of the Apocalypse

In the context of the apocalypse, all surviving humans have entered a system called the Lost Manor. Everyone here is a manor owner, and everyone is a prince or noble. There is a handsome man here - "Hey, my prices are very high!" There are sisters here—"Humph, move your crumbling castle away from me!" There's a villain here—"No one can take what I want away from me yet!" There are relatives here - "Sister, all the flowers I've been waiting for you to save me have withered. How about I go find you?" There is also the most terrifying boss here - "Why didn't your super-scientist mother tell you that I created this system?" . . . . This is the story of a heroine who drives a castle to rescue her younger brother.