Jyoji Yuuki, better known as Riderman (the fourth Kamen Rider), was a scientist working for Destron until one of the organization's own agents set him up as a traitor. As punishment, he was dunked in acid, which cost him his right arm—though he managed to escape. Determined to clear his name, Yuuki became Riderman and initially set his sights on taking down Kamen Rider V3. But after learning the full truth about Destron from V3 himself, he had a change of heart and joined the fight against the organization instead.
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