Since the "Great Submergence," global sea levels have risen by an average of 60 meters. The stable old order of the past vanished along with the major coastal cities of every nation. The whole world returned to an age of endless warring states. Unlike in the past, the main forces of each nation are no longer its armies, but its navies, along with their supporting air forces and marines.
Nearly five and a half centuries have passed. In this chaotic age, a boy born in the Shanghai Sea Region happens by chance to save a mysterious girl, and so begins his eventful life...
When the vast ocean and boundless sky meet, our legend begins.
