From Tokyopop: In 2068, Brain Computer, created by people, to be the core of the Earth, managed by the machine, himself creates Leave, android, which is much superior to the ability of people. Since humanity is now an unnecessary aspect of the Earth's ecosystem, Leave, together with his "father," Fenrir (a scientist-man who raised him) destroys humanity and instead creates four "mothers", which, in turn, create an android race, inspired by known as selenoid. They divide the world into four parts, each of which is managed by the mother, and then further divide the android population on hierarchical levels with strong at the top and weak below. Almost perfect society ... And it would remain perfect if some of the surviving people did not.