Well technically the story starts off in Kado's perspective making him the main protagonist. There are four main protagonists but the story is Kado's mainly. It starts just before he meets Mara.
The story is in my own world. The planet is called Nativma and the continent is called Medeis. I'm not sure how to explain it without going into the entire history of it all. i'll just briefly go over it
So there were these two beings, Duns and Lins, who were enemies. Eventually, they fought and Lins almost lost but with his remaining power he trapped Duns in a star (sun) and built Nativma around himself.
He created the races to protect the surface of Nativma and created the three moons to protect the outer area. Medeis is the closest link to Lins so that is the only continent that allows the races to use magic. Since Lins was a being of darkness, the races are infected by his magic (I like to imagine a lot of veins running through everything on Medeis and magic is the blood) and that's why there are so many wars. The magic corrupts anyone who overuses it and it creates conflict. The affects of magic vary a bit depending on race though.
Um I suppose the closest time era would be middle ages-ish. Kind of your typical fantasy setting with a lot of mythical creatures and magical places.