All Kamen Riders are set to battle against unknown enemies and compete with each other in survival games named Desire Grand Prix. Only true heroes who win the competition will be granted the right to bring their ideal world to life.

The "Desire Grand Prix" is a game to protect the peace of the city from the threat of the mysterious enemy "Jamato", whose origin and purpose are unknown. Each participant transforms into a Kamen Rider and competes to win the game by defeating enemies and saving people. The winner of the Desire Grand Prix will be rewarded with "the right to bring an ideal world to life" as a prize. In other words, only the true heroes who win the competition will be able to realize the world they have wished for.