45 years ago, a man was subjected to the experiments of the secret organization Shocker and became a cyborg. Since that day, the man??s sole mission has been protecting humanity and justice from the threat of Shocker. His name is Takeshi Hongo, the first Kamen Rider.
Forty-five years since his transformation, he has returned to Japan once more to recruit Takeru Tenkuji, Kamen Rider Ghost, and Makoto Fukami, Kamen Rider Specter, in order to help him protect a girl who seems to be crucial to Shocker's plans to resurrect Ambassador Hell. However, the years have not been kind to Hongo, whose cyborg body has become weaker. They must also contend with another evil organization claiming to be Shocker known as Nova Shocker.
In the wake of this new threat to the world, Takeshi Hongo transforms as his voice cries "Henshin!"