GAIA is about nature's constant struggle with mankind, and the negative impact the human race imparts upon the natural world. It is situated in the fantasy realm, titled 'Eden', a world inhabited by peaceful 'Creatures'. All is well, and they enjoy its untouched beauty, until the ground breaks and a vulgar metallic tower emerges. The tower, named 'Overlooker', brainwashes and commands the Creatures to help it in ingesting grass, water, trees and anything else preserving Eden's beauty. Eventually, it towers over a conquered wasteland. When all hope seems lost, a seed drops from the final tree, and from it hatches 'Gaia', the earth's protector. Itself and the Overlooker engage in a struggle to save Eden from this evil structure once and for all.