The interplanetary spacecraft Galileo II carries Atom and his friends to Titan, a satellite of Saturn. However, what awaits them when they arrive there is an attack from an unknown entity. What appears is a mechanical life form called "Igza" that wants to destroy humans. The battle between Atom and Igza unfolds in the far reaches of space.
Astro is a robotic boy created by Dr. Tenma to replace his late son. When Tenma destroys his laboratory and shuts down Astro the Ministry of Science revives him, and tries to give him a normal life as a 6th grade student that occasionally helps keep renegade robots from causing harm.
Tanaka-kun is always in a state of blissful lethargy, with a desire to be as listless as possible. Now, if only his responsible classmate, Ohta, would leave him alone to laze in peace!
Koyuki Tanaka's boring life is changed after meeting Ryusuke Minami, a local musician with a bad attitude, who introduces him to foreign music.
