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Kamen Rider Reiwa: The First Generation is a 2019 Japanese superhero film in the Movie War line of the Kamen Rider Series. It serves as a crossover between the television series Kamen Rider Zero-One and Kamen Rider Zi-O and is the fourth film of the Generations series. The film also pays tribute to Kamen Rider Zero-One, the original Kamen Rider series and the entire Heisei Kamen Rider series as a whole. It also introduces Gai Amatsu as Kamen Rider Thouser.