Under the rule of "Superior Dominance" all humans are born in vitro and given to carefully selected parents. At the age of 14, all children are put through brainwashing where their memories are wiped by "Superior Dominance" and overwritten to produce functional adults. A race of advanced humans with psionic abilities called "Mu" (pronounced myuu, μ) has evolved, and the supercomputers that control Superior Dominance make every effort to exterminate them. Led by Soldier Blue and then Soldier Shin, the Mu make every effort to locate and rescue as many "Mu" children as possible before the children are discovered and eliminated. The "Mu" have only one wish, to return to what they see as their promised land, Terra.