The series is characterized by its exploration of the theme of genetic engineering, and the possible consequences of this technology dominating and defining future human society.

It also contains a distinctive metal soundtrack with electronica elements (composed by Akira Takasaki), often featuring electric guitar solos at dramatic moments.

Made entirely using CGI, this humanoid robot's design appears to resemble gray mechanical cranes, lacking appealing characteristics common to other Mecha, such as bright colors or even a 'head'.

The government is in control of human reproduction, and is in charge of all (artificial) births, as well as altering the genetic characteristics of every new individual, according to their function in society.

This instigates the mobilization of a special group of men and women with specific genetic characteristics, who set out aboard the Bilkis spaceship to investigate the origins of the ring, and the possible connection with mysterious alien technology found in Jupiter's moon Ganymede.