Takeshi Hongo, who is training for a motorcycle race, is suddenly swallowed by a crack in the ground. He transforms into a Kamen Rider and barely escapes danger, but he is attacked by the Shocker monster Earthworm Man who caused the crack in the ground. Rider was tormented by the worm man's attack, but he cornered the worm man with a rider jump and an undercut... Published in 1972, Mitsuru Sugaya's version of "Kamen Rider", which built the golden age of the magazine "Boken-oh", has been made into an e-book as a complete version!