In this dystopian society, there is a set of fraternal twins living in two separate worlds. One meant for only female-borns, and one meant for only male-borns. The two are not allowed to mix, and the females are the dominant ones. However, males have no idea females exist. But one finds out and tells his best friend. His twin sister finds out in her own world the truth, and her mother is taken away. So the twins have to find a way to end this world before it's too late.