There are four civilizations. One is a strong military fortress. One is a wealthy city of aristocrats. One is a peaceful, nature-loving village. One is a religious city built high up on stilts, in honor of their sky spirit. Once governed by a strong Central City, they are now bitter enemies and the Central City lies in ruin. All the adults in the cities are firmly against each other. But not all the teenagers are.
When the four civilizations go to war, loyalties change. People run away, join new civilizations, and come back. Friendships are formed, people fall in love- not always with people from their own civilization- and will do whatever it takes to survive.