Drawing influence from the street musicians of Miyagi, four high school students form a band and spend their free time practicing for their school's upcoming festival. When the festival is abruptly concealed, they come up with a dimwitted strategy of faking a bomb threat to the school in order to force the principal to change his mind. Their plan seems to work at first, but when a real bomb goes off, the group is forced to take responsibility for the explosion and they are kicked out of school. Three years later, more details of the incident is revealed as the youth look back on the past.
After a car crash, a comedy duo wake to discover themselves in an army infirmary. At first they think they are in jail, then slowly realize that it is August 1945 and their colleagues are actually training for one-way flights to American battle ships.
Brain is the world's greatest computer, and also the most intelligent being on planet Earth. One day, Brain decides to abandon its terrestrial moorings, and it's up to The Defenders to track it down. Unfortunately, Brain has developed an amazing army of deadly giant robots, including one with a huge "17" emblazoned on its chest-plate, with which it plans to subjugate its creators. A young boy whose family was killed by Brain's followers manages to activate Daitetsujin 17, which thereafter comes to his rescue whenever he is in danger from Brain's minions.
Young assassins Azumi and Nagara continue their mission to prevent a civil war. In their hunt for Masayuki Sanada, who is protected by both an army and a dangerous clan, they meet Ginkaku, a person who shows a remarking resemblance with former friend Nachi.
