20XX Year, Metropolis Festival
Dr. Ochanomizu, a minister of the Office for Science, visits circus to watch a robot circus.
And he finds Astroboy who has been sold to the circus, and rescues him from a robot circus.
From Dr. Ochanomizu, Astroboy learns how to live together with human and to control his powers.
As Astroboy goes to the school and makes new friends, he meets various people including those who treat a robot like their friend, those ho look up to a robot, those who are afraid of a robot, and those who are hostile to a robot. But through many incidents where he saves people from dangers, Astroboy starts getting closer to people, And people begin to open up their hearts to Astroboy.