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Official Site: Bandai

, is a weekly science fiction story created by Japanese manga artist Shotaro Ishinomori. It debuted as a tokusatsu television series on April 3, 1971 and ran until February 10, 1973, airing on the Mainichi Broadcasting System and NET TV (now TV Asahi). A manga adaptation was also featured in Shōnen Magazine around the same period. The series has spawned many sequels and evolved into a franchise. The cultural impact of the series in Japan resulted in Akimasa Nakamura naming two minor planet in honor of the series: 12408 Fujioka, after actor Hiroshi Fujioka, known for his portrayal of Takeshi Hongo/Kamen Rider #1, and 12796 Kamenrider, after the series itself.

The story took place in a world plagued by Shocker, a mysterious terrorist organization. To further its plans for world domination, Shocker recruited its agents through kidnapping, turning their victims into mutant cyborgs and, ultimately, brainwashing them. However, one victim named Takeshi Hongo escaped just before the final brainwashing. With his sanity and moral conscience intact, Hongo battled Shocker's minions as the grasshopper-themed superhero Kamen Rider. Another of Shocker's victims, freelance photographer Hayato Ichimonji, had also been given cyborg implants, but was saved by Kamen Rider from the brainwashing process to become Kamen Rider #2. Assisted by motorcycle race team manager Tobei Tachibana and FBI agent Kazuya Taki, the Kamen Riders fought in both solo and partnered missions against both Shocker and its successor organization Gel-Shocker.

Many manga based on the original Kamen Rider series have been published, but only the following few were penned and drawn by Ishinomori himself:

The original manga published in 1971 diverged from the plot of the television series in several ways. In the manga, Hongo was outnumbered by twelve Shocker Riders (as opposed to six in the television series) and was subsequently killed. Hayato Ichimonji, one of the twelve Shocker Riders, received a head injury during the fight and regained his conscience as a result. He then turned against Shocker and succeeded Hongo's role as Kamen Rider. However, Hongo was resurrected near the end of the manga story.

Kamen Rider One has not been a contender in any CBUB matches.