Even though this world I've made is pretty big, most of Lunar Syzygy's action takes place in or off the coast of the country known as the Federal Territories. Once much more united, it's now a loose group of walled city-states, with some small unwalled towns and villages outside the walls and plenty of wilds between them all. They have walls to keep out vicious monsters living in the aforementioned wilds, from creatures that resemble larger versions of normal animals to strange hybrids. These monsters have such an intense taste for sentient flesh that monster hunting is a common blue collar job. Some monsters have made it past the walls but they usually don't last long.

The city-states can get fairly large, encompassing forests, quarries and multiple towns and cities, among other things. Most of them are interconnected by a transcontinental maglev railway that makes travel between them fairly quick. Otherwise travelers will have to take the roads and pray their cars don't get attacked. The people living outside the city-states are usually tribes or nomadic groups who have been living just fine without walls for centuries, and they'll continue to do so for as long as possible. The Federal Territories' government is run by three diverse elected officials and a senate.

Though they have technology like maglev trains, cars, and even robots, most of the Federal Territories' technology level is at that of America in the early 2000s.