It's 2155. There are two groups of humans on Earth: the Genetically-Modified (Gen-Mod) Humans, and the Normals. The Gen-Mods live on the surface world, while the Normals live underground. This was a result of a nuclear war from 2070. Now there's a way for the Normals to finally live on the surface world: By transferring them to a human-life-suitable planet called GH569. There are several cities set up and lived in already by the Gen-Mods. This was to get everything in order for the Normals.

Everything sounds amazing, does't it? For Earth Gen-Mod Cassie; Undergrounders Hannah, James, and Damon; and GH569 Gen-Mod Liam, there's something much more sinister on GH569. They'll uncover secrets about the planet, and themselves. How will everyone react? How will everything go down? You'll see...