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The five competing Riders must team up against a Jyamato team in the tournament's ball-themed second round, "Jyamaball". In the middle of the match however, Keiwa is suddenly accused of being a traitor.
As a new DGP gets underway under the direction of a new Game Master to replace the disgraced Girori, Ace, Keiwa, and Neon are joined by two new participants in spectacular fashion. This time however, new rules tailored to limit Ace's power become known, such as popularity reviews. Meanwhile, Michinaga awakens in Archimedel's garden, having been resurrected by his constant use of the Zombie Raise Buckle, and eventually learns the Jyamato have gained the ability to mimic fallen players' appearances.
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 hero who wins the competition will be able to realize the world they have wished for.