A young Kamen Rider fan's wish to see the Riders in person comes true, kicking off the ultimate Japanese superhero crossover movie. The third installment of the Heisei Generations series features Kamen Rider Zi-O and Kamen Rider Build joining forces with all the other Riders of the Heisei Generation to reverse the damage caused by the evil Time Jacker and save their legacy. Do the Kamen Riders really exist? Will you believe it?