The setting is space, thousands of years after earth, having been destroyed from a forgotten catastrophe*, has been completely deserted and forced humanity to take refuge in interstellar colonies.
The colonies consist of toppled urban cities that look almost like they were quickly referenced off old cities from earth (they were, by the attendants;) they all have that early 2000s grunge-ish, retro industrial feel to them. 
The economy now heavily relies on the extraction of various minerals from surrounding, uninhabited planets which is all ran under an organization- Global Space Collective - which also kind of loosely functions as the government, Attendants being at the very top.
They facilitate and monitor as well as keep track of the astronauts that go on the voyages to collect the minerals or make way for more colonies.