After the fall of mankind. Their creations, a diverse race with each having their own unique characteristics that is know as the Hybrids now control the Solar System. Or what was left of it.
The flaws that humanity had still exist within the Hybrids, discrimination and infighting often happens. War and rebellions often happens.
Even though there is peace now, they still face a threat. The same one that fought against their creators. Now, they compete in a arms race. To see which Hybrid would conquer all and defeat the threat, known as The Infestation.