Set in the future, a giant fighting machine called the Aquarion is humanity's only effective weapon in the fight against the technologically advanced species called the Shadow Angels.
Reality and fantasy seem to be breaking down for student Kyo Sogoru. Is he really a smart but unpopular swim enthusiast at Maihama High School, or is he a pilot of a giant robot in a war-devastated world? Which life is real and which is fantasy?
At the Personality Plant, robots are being built and slowly outfitted with the artificial memories of real people. Suzu is one such robot, being made to replace the young boy a family has lost. By chance, he meets Hitori, a young girl suffering from progressive memory loss. The two children become friends and attempt to define themselves in the light of their changing memories.
