(i've checked and their wasn't a thread for this series, so i've made one)
Kamen rider is a manga series and sentai/Tokusatsu series both ran around the same time period.
the plot of the original series:
The story took place in a world plagued by Shocker, a mysterious terrorist organization. To assist its plan in world domination, Shocker recruited its agents through kidnapping, turning them into mutant cyborgs and, ultimately, brainwashing them. However, one of the victims was rescued just before the final step, and his name was Takeshi Hongo. With his sanity and moral conscience remaining intact, Hongo assumed the identity of the grasshopper-looking altered human (改造人間, kaizō ningen?) superhero Kamen Rider and battled Shocker with his newly acquired powers. However, another of Shocker's victim is the free-lancer photographer Hayato Ichimonji, who was submitted to become a cyborg, only to be saved by Kamen Rider from being brainwashed and becomes Kamen Rider 2. Together, they teamed up to bring an end to Shocker's reign of terror and later Gel-Shocker.
i recommend watching the movies of the original series based more on the manga there pretty awasome

My favourite series is kamen rider Den-O, very comedic but also cool