Kazuya Oki volunteers to undergo cybernetic surgery in the International Space Development Program in the United States to become an astronaut who can survive in outer space without the need for a bulky external suit. After a successful operation, he is given the codename "Super-1". However, before he can depart for space, the base where he underwent the procedure is attacked by the Dogma Kingdom. Only Kazuya manages to escape and is determined to avenge the deaths of the scientists. He returns to Japan and trains under a martial arts expert, Master Genkai. With this newfound knowledge, he transforms into the powerful Kamen Rider Super-1 to fight against the evil Dogma Kingdom and later, Jin Dogma.
