Humanity, a species forever locked in self-destruction. From the smouldering ashes of the nuclear holocaust, the survivors welcomed the Gray Dawn. This is the "Acid Rain Era".
In the Acid Rain Era, old borders dissolved and new powers emerged. The new world order gave rise to a formidable new technology - the Synchro exoArmor.
Acid Rain World originated from the vision of a humble but passionate artist - Kit Lau.