In a not so distant future...
Humanity has managed to survive by living on the Floating continent, the last safe haven on Earth where life is still possible amidst the pollution.
As conflict is no longer, the people live while progressively reclaiming past civilization.
However, their peaceful lives were shattered by the sudden attack of the Dragon, putting the existence itself of the Floating Continent in dange.
While humanity fights to repel its attack, they are faced with choices that will determine their fate. By unraveling the mystery behind this world's origins, they will face the decisions to lead it towards an ideal future.
This is the story of humanity's final choice in order to live together.