Centuries have passed since the Communist Federation defeated the capitalist Empire, but humanity is still divided. A vast artificial-intelligence network, a psychiatric bureaucracy, and a tiny egalitarian council oversee civil affairs and quash 'abnormal' attitudes such as romantic love. Disillusioned civilians renounce the new society and either forego technology to live as 'primitives' or enhance their brains with cybernetic implants to become 'cybos.' When the Empire returns and takes over the minds of unsuspecting citizens in a scenario that terrifyingly recalls Invasion of the Body Snatchers, the world's fate falls into the hands of two brave women.