The protagonist, Ken Kusanagi, is subjected to a改造手術 (modification surgery) by the evil organization Megadeath and transformed into the superhuman Cyber Z1. However, Ken Kusanagi, who has not lost his sense of justice, decides to fight for justice and escapes from Megadeath's hideout... Meanwhile, a young man is attacked by a monster from Megadeath... And then, Joe Matsudaira appears before Ken Kusanagi, who is tracking the monster's whereabouts. Joe Matsudaira is also a superhuman, Cyber Z2, created by Megadeath, and his mission is to defeat Cyber Z1, who is Ken Kusanagi...!
