Long ago, settlers from a faraway continent built a floating city under the command of the Engine Master. High above the mountains and sprawling pine forests of the new land, Morinuin runs on coal and steam, and bustles with automatons and flying steam cars as well as humans. It's the year 121, and the Native villagers below the city are getting in the way of the coal mines. War breaks out and everyone must take a side. It won't be long before the city will run out of energy, unless someone finds another power source... Aneka does all she can to provide for her younger brother, Oliver. That's the way it always has been, at least since the siblings' parents died. But everything changes when their parents' legacy leads them to a quest to save their dying city, Morinuin. In search of a new power source, Aneka and Oliver are joined by a pickpocket, a royal servant, a former assassin, and a Native outcast to find the enigmatic Engine Master, who disappeared long after Morinuin was built. Will their mission keep the city afloat amidst war and death?