As Kamen Rider G4, Kazuki gains the ability to fight against Overlord's minions and other enemies. However, he soon discovers that the G4 system has a mind of its own and often takes control of his actions, leading to conflicts and struggles within himself.
Throughout the series, Kazuki forms alliances with other characters, including a scientist named Shigeru Akatsuka, who helps him understand the G4 system, and a mysterious woman named Rina, who becomes his love interest. Together, they work to uncover the truth behind Overlord's plans and the secrets of the G4 system. kamen rider g4