Anachronistic story where magic/fantasy races and stuff have always existed, each fantasy race has varying degrees of conflict with each other. Historic events like cruzades, dark ages, french revolution, world war I and II, cold war, etc happened involving all of them and shaped their culture and interactions. Each fantasy race has its own country and stuff.
MC is starting university and moves to a dorm where many international students from all races live.
Story starts off as comedy/slice of life as the characters work out their differences and show their world view, it drops bits of world-building.
Eventually an international conflict starts developing and the students get affected by it.
Plot develops not so much in a "group of students saves the world!" silly thing but more in how their lifes get swept into a situation they cannot control and how they deal with it to at least keep their own immediate personal worlds from crumbling under the pressure.