The series follows the story of Takumi Hino, a young motorcycle stunt rider who becomes the Kamen Rider, a masked superhero with extraordinary abilities. Takumi's transformation into Kamen Rider occurs after he is exposed to a strange, meteorite-like object called the "Legendary Horse," which imbues him with superhuman powers. As Kamen Rider, Takumi fights against the Shocker, an evil organization led by the mysterious and powerful leader, Doctor Shorron.