The only part of this novel that I can remember is that they are in this “game” (?) where they are in a city that will be overrun with monsters. In this city there are safe spots that can only be occupied by a certain amount of people. There is this one dude occupying most of the safe spots and he has this landlord (?) ability where he can control a certain part of land and has the power to control turrets, etc. The MC returned from the future and the person who could control the turrets was described as a great evil or something.
Yea, Omniscient Reader. You're talking about the chaps where they must occupy a green land before night time.