Humans live on colonized planets in the future, and they are governed by a computer system in every aspect of their lives. People with superhuman abilities have been created as a result of evolution. Mu is the name of this new race. Humans despise and loathe the Mu, who yearn for a peaceful place to call home: Earth—a magical faraway planet—for mankind had to abandon their home long ago when pollution and devastation grew to the point where it was no longer feasible to stay.