Observing the City
The city was still operational, people could still go to a restaurant to eat some food, even go to a café that offered many different beverages, many of which had not existed in the past. With the appearance of the system, even though electronics didn't function anymore, with mana and mana crystals, people actually had access to many things that they once had, some that were even superior.
Do you want to have an espresso?
Fine, here you go, an espresso machine that works just like the old one, only that it is now powered by mana instead of electricity.
Do you want to drive a car to get around the city faster?
Nah, you can't do that, but, you can rent either a small vehicle that is reminiscent of a car that is powered by mana or you can even rent a monster from the monster transportation building that the Butcher had created.