Humanity was on the brink of extinction due to the unexplained appearances of 'Cryptids.' Amidst the chaos of never-ending slaughter, a beacon of hope appeared for humanity, 'Phenomena.' Phenomena are unexplained abilities that were given to half of the people around the globe, though how they emerge are unknown. Despite the different kinds of Phenomena that humanity gained, it still wasn't enough to drive the terrifying Cryptids away from the face of the earth.

It's the year 3000. All of the modern civilizations that stood on the ground have collapsed, and many kinds of Cryptids are roaming the land. But, due to a type of Phenomenon called 'Eden's garden,' three cities were formed floating in the sky that gave humanity the chance to rest and develop for the past years. Mechanica, Cybertown, and Gearmany were floating at different locations.

Cybertown. A city filled with many people and buildings that even the streets can't fit a car is where Aki, our main protagonist, and his unit, will start their adventure to save the remaining people from a crisis.