Set a hundred years from now, in a familiar yet futuristic vision of Japan where society is run by incredibly human-looking robots, a boy meets a strange girl. With society divided on the line between progress and losing sight of the definition of 'humanity', a choice looms for 17-year-old Endo Arato. Is it easier to change oneself to fit society or change society to fit oneself?

Waking up, a special hIE must seek help to find out who he is, and what's his purpose in life is.