Mysterious monsters appear to attack the city and a team of Kamen Riders is assembled to fight them in a competition. One of such riders is Ace Ukiyo who can transform into the fox-like Kamen Rider Geats.
Keiwa, Neon, along with many others are chosen to participate in the previous survival competition Desire Grand Prix within a reset timeline which Ace decided.
Neon is infected by a Zombie Jyamato's bite during Round 2 of the Zombie Survival-theme bout of D.G.P. while her mother deletes all of her streaming videos.
As Morio believes his odds of winning the third round of the D.G.P. have improved after becoming Michinaga's new partner, Keiwa begins training with Punk Jack to better his chances.
Only Geats, Tycoon, Na-Go, and Buffa remain as the Desire Grand Prix's final round commences, with the fate of the world resting on a game of "kick the can", who'll be the victor of the D.G.P. tournament?
Keiwa's older sister, Sara has been kidnapped by a Knight Jyamato. Despite his injuries, Keiwa is re-motivated by Ace not to give up on saving Sara, while the latter apologize for using the former during its first round.
The next bout of the "Stratagem" DGP sees the players helping collared vine-covered civilians, such as Keiwa, escape a Jyamato labyrinth and fighting a Jyamato that obtained the means to transform into a Kamen Rider-esque form.
As the players struggle to decipher a code that will let them escape a mansion and save the captured civilians from the Jyamato Riders, Win tries to give Michinaga tips on how to outwit Ace while finding their owns of escape.
Keiwa rejoins the DGP after new player Ittetsu Tanba voluntarily gives up his place in the tournament to him and becomes motivated to revive those who have died in previous DGPs.
Following Ace's disqualification, Keiwa, Neon, and Michinaga struggle to win the "Conspiracy" tournament and potentially become the new "Desire Deity".
Refusing to allow Ace to be declared the winner of the "Conspiracy" tournament, Girori sets up a new final round where either Keiwa or Neon could win if one of them kills Ace.
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.
Following Daichi's elimination from the tournament and confirmation that he is not the Desire Star, the remaining players must find a fruit-shaped time bomb hidden by the Jyamato to identify the Desire Star in the next round.
Sae discovers she has become the Desire Star and must complete a Secret Mission. However, she also learns her remaining family were taken hostage the previous round.
Due to the Jyamato not appearing in the latest round, the DGP's producers fear their ratings will decline and make the Riders compete in a modified form of tag wherein they must capture Chirami, who reveals he was forced to become the Game Master before running away.
The Jyamato force Chirami to become a boss in the tournament instead of one of their own so they can steal his Vision Driver and use it to seek out the Goddess of Creation for their own ends.
When Michinaga enters the Jyamato Grand Prix, his best friend, Toru, who he thought was killed during a previous season, appears before him and, to his astonishment, asks to work together to make his dream come true.
Ace finds himself in trouble due to the Boost Mark II Buckle's side effects, but narrowly survives with Keiwa and Neon's help. Having witnessed what happened, Ziin becomes hurt before Ace tells him about his life.
On Neon's birthday, Michinaga uses the Vision Driver he stole to establish a one-on-one fight with Ace in the JGP's final round. However, Beroba has her own plans for the round.
As Neon becomes devastated by the truth behind her existence, Ace acquires assistance from her supporter, Kyuun, to help her overcome it and move forward.
The final round of the JGP begins as a section of Earth gets separated and floats into the air, with trapped innocents being corralled by the Jyamato into colored circles.
With the returning Jyamato taking advantage of Michinaga's wish to overpower him, Ace approaches Michinaga with an offer of an alliance to deal with the Dunkleosteus Jyamato.
Although Archimedel's legacy has ended, the Desire Royale goes into overtime as Michinaga confronts Neon and the Sakurai siblings before attacking Keiwa.
Despite obtaining his new power and form, Ace fails to reach his mother and finds himself in a strange dimension where he is approached by mysterious man in a fox mask.
The world has been remade and a new Desire Grand Prix has begun. Ace recalls his memories of previous players like Keiwa and Michinaga, saying that he will never forget them and the desires they fought for.
With help from Kekera and Beroba, Keiwa and Michinaga return to their Rider duties to join Ace in stopping the parasite Jyamatos' widespread infections on civilians caused by Daichi.
In order to make his wish come true, Keiwa begins colluding with Kekera and Beroba to kidnap Tsumuri, who also possesses the abilities of a Goddess of Creation. With the mighty power of Bujin Sword, Keiwa sets his sights on a new enemy.
With the Parasite Jyamato round over, Keiwa's wish to revive those who were victims of the previous DGPs and free those who were trapped inside Jyamar Tree, such as Sara, has been granted.
Michinaga and Ace attempt to save Keiwa from himself, but he refuses to listen while consumed in darkness over him indirectly killing his family with a wish that was meant to bring them back.
Beroba recruits Kanato Sumida, formerly Kamen Rider Dapaan, to help her get revenge on Neon, for making her feel despair. Meanwhile, Keiwa resolves to defeat Ace, and turn Tsumuri into the Goddess of Creation.
After deploying Win to rescue Tsumuri, Ace sacrifice his freedom by absorbing Tsumuri's power to prevent DGP from misusing it to enact misfortune endings, and frees Keiwa from being manipulated by Kekera and Beroba and the organization. Furious by his own failure, Jit created an evil doppelganger of Tsumuri. In response and concurrently, despite having no, Michinaga takes his risk dispose his and Keiwa's former supporters.
As Ace's life force as a God of Creation is starting to run out before he gets petrified, his friends must stop Zitt and Kekera from destroying Earth, with a redeemed Keiwa must settle against his former supporter alone to atone his deed.
Suel's plan of the DGP's Series finale turns Earth into an apocalyptic war amongst everyone killing each other for a chance at happiness. Ace wants to end this game for the sake of his world, but is confronted by Black Tsumuri.
Tsumuri points her Magnum Shooter 40X at Ace - and a gunshot rings out. Was Ace shot?. A world where everyone can be happy, just what is Ace's true wish? For that - we witness the end.
