Job-hunting student Keiwa Sakurai fails yet another interview. His older sister Sara treats him to Tanuki soba to encourage him. However, instead of actually encouraging him, she is obsessed with watching the latest livestream of her favorite celebrity influencer, Neon Kurama. At the same time, a mysterious transparent wall appears and seperates the two siblings. A monster known as the Jyamato appears in the area and attacks Keiwa and other unlucky people trapped inside the area. Keiwa also runs away from Neon, who was streaming in the area. Just what in the world had happened? Then, Ace Ukiyo appears in front of the two, and approaches the Jyamato...

Ace, who became the winner of the Desire Grand Prix, the "Desire God", has gotten his ideal world. Meanwhile, Keiwa receives a Rider Core ID as well as a Desire Driver and is invited into the Desire Grand Prix. As he cautiously equips his new gear, he is suddenly transported into the hall of the Desire Temple. There, he finds Neon, Michinaga, and Ace. As various young men and women gather, they are about to participate in a new game that's just about to begin...

The next game to be held is "Zombie Survival Game" to protect the city from Zombie Jamato.

"Thank you for your hard work, everyone. The lowest score is ..." Desire Grand Prix Round 2 "Zombie Survival Game". Following Soto, even Neon is bitten by a zombie, and the suspicious zombie hunt becomes extremely fierce. Unstoppable zombie waves, Neon's body gradually becoming a zombie, and a secret conversation between Michinaga and Kanato... Eventually, the countdown of life begins and Neon becomes timid. What was she looking for, what was her "wish"? What is the choice that Neon, who sways between lives, chooses?

Michinaga continues showing his hostility to Ace while they are called into the the next round of the Desire Grand Prix, which requires the five remaining contestants to pair up. While the pairs are decided through lottery, each team fights to eliminate the Jyamato. However, because there are an odd number of remaining contestants, the Desire Grand Prix management sends out one of their own, the mysterious Kamen Rider PunkJack to pair up with the outlier. Who exactly is he and which pair will emerge victorious?

Morio uses his special VIP ticket to become Buffa's new partner, while Tycoon is now paired with PunkJack. Despite being upset at losing his best chance of winning, Keiwa begins training with PunkJack. Michinaga doesn't seem to care who his partner is. As long as they lead him to victory by any means, he will consider that justice. Just what happened in his bitter past that led to his hostile nature towards Geats and the others?

While Neon is out livestreaming, a Jyamar Area suddenly appears. The final mission, "kicking can game" has begun! The Jyamato this time is a powerful final boss with the capability to destroy the world. It is said that it can be defeated by targeting its power source cans at its feet. That means the Rider who can "kick the can" will become the Deza Shin! Ace, Keiwa, Neon, and Michinaga face off against a mighty enemy!

Sara is kidnapped by the Jyamato. Keiwa, who learned of this incident, rushes to rescue her despite his injuries. He transforms into Tycoon in front of her and fights the Jyamato while trying his best to protect her. At that moment when Sara touches Tycoon's ID Core, she remembers a terrifying moment from the past that he had forgotten. What is the shocking truth behind the past that the Sakurai siblings share?

Although the can was kicked outside the Jyamar Area, it had expanded once again. Thus, the can returns inside and the giant Jyamato swallows it once again. In this abnormal situation. Ace, Neon, and Michinaga are given an emergency mission to "raise eggs." If it hatches, it may drop an item for capturing the final boss. Ace, who aims to become the Deza Shin once again, raises his egg while fighting the Jyamato but...

The ideal world of Ace, who became Deza Shin, has began. However, Tsumuri calls it "an unacceptable world". Ace appears and calls Tsumuri "Big Sister"...!? Game participants were gathered at the Desire Temple, and a new game began. Among the participants were Ace, Michinaga, and a man with a guitar. The Game Master, staring at a man through the monitor, eerily murmurs. "Your turn. I beg of you, Win Hareruya"

The second round of the Desire Grand Prix is a "Labyrinth Escape Game". Ace, who was transferred to a different space created by the Jyamato, has to pair up with ordinary people who got lost in the labyrinth and escape while protecting them. Ace and the others find a door that seems to be an exit, but it won't open unless its code can be deciphered. Then the Jyamato appear, and Ace and the others try to transform into Riders and protect the people, but the Jyamato, who have achieved an amazing evolution, attacked the Riders!

It seems that in order to escape from the Labyrinth, a password is needed to open the door. Win, who is confident that he knows the clue, asks Michinaga if they can outwit Geats and escape on their own. Meanwhile, the Jyamato appear in front of Ace and others. Keiwa, who was hit by Yoshiki, who was trying to protect his sister while being tightened by a collar and suffering, decided to fight and protect people. "What should I do...?" Ace shows his driver to Keiwa, who is lost. "Touch it."

Everyone's Desire Drivers were stolen by a mysterious girl in a red hat. In actuality, this was the signal for the third round of the Desire Grand Prix to begin. The next round is a game of "Musical Chairs" where each player bets on a seat. Of the five remaining players, one of the Drivers has been stolen and used by the Jyamato, so the remaining players must compete for the last four. The one left standing without a Driver before the "stage boss" is defeated will be eliminated. With each of their fates intertwined... who will lady luck smile upon on?

In order for Ace and Win to survive, they must reclaim their Drivers back from the Jyamato Rider. Girori, who is confident of his "victory" that Geats will finally get eliminated, smiles with Win. Is it possible to save Ace from this predicament? Keiwa and Neon fight with hesitation while Michinaga aims to defeat the Jyamato in order to secure his victory over Geats. Will Ace find a way to turn this around or face unprecedented failure?

The final boss has appeared, marking the final battle of the Desire Grand Prix. For the title of Deza Shin: Keiwa, Neon, and Michinaga transform into Kamen Riders and make their stand against the final boss. While Tycoon and Na-Go struggle against the final boss, Buffa takes a heavy blow and is forced out of his transformation. "Why... What difference is there between you and me?" Michinaga vents his frustration at Ace because he is no longer able to use his own powers. However.... Ace has already dropped out of the game and lost his memories of the Desire Grand Prix...!

Ace, Keiwa, and Neon are told that the "decisive battle to crown the Deza Shin" has now become a "fox hunt" in which they compete to exterminate Geats. Keiwa and Neon hesitate to follow the new ruthless rules set by the Game Master, Girori. Ace, who is now a target, can't afford to lose in order to make his ideal world come true. In the end, both Keiwa and Neon set aside their own hesitations and decide to fight!

A new edition of the Desire Grand Prix has begun! Ace, Keiwa, and Neon are joined by two new participants in the most spectacular way. The first round begins with Tsumuri's navigation. The five of them all transform into Kamen Riders and confront the Jyamato, but new rules have since then been implemented. What are those shocking rules that could shatter Geats' undefeated streak?!

The second round of the reborn Desire Grand Prix is ​​"Jyamar Ball". It is a group competition in which the Riders and the Jyamato compete for the ball and put it in the opponent's goal to compete for points. Ace and the other Riders form a team and fight together, but the game turns into a close battle. In the midst of such a battle, Keiwa is suspected of being a traitor due to certain actions. He is driven into a corner...!?

Ace reunites with Michinaga, who wanders alone. Michinaga tells Ace "You guys have no idea where the Jyamato actually come from." The final round of "Jyamar Ball" has begun. Keiwa is isolated while being suspected of being the Dezastar, but he solidifies his new resolve in front of the children who are being evacuated. "I will protect the children. I will win this game!"

Daichi, who was kicked out of the game, was not the Dezastar. The remaining four players are forced to find the Dezastar again, all while being told of the start of a new "time bomb game". A time bomb that the Jyamato have planted somewhere has to be found and defused. Geats and the others start looking for the bomb, and find out that the bomb the Jyamato have planted resembles a fruit. When Keiwa learns about this, his anxiety starts to grow...!

Sae's family is targeted by the Jyamato, with a melon bomb ticking down to their doom. She races to save them as the others frantically search for more bombs. Meanwhile, Beroba presents a certain strategy to Michinaga. He then attacks Lopo for some reason. However as Buffa rages, Kamen Rider Gazer appears! Is this Rider with overwhelming strength an enemy or an ally?! And behind these battles, there is always a plan as the game of suspicion continues, the Dezastar is actually…

In this round, the Game Master is the enemy!? The Jyamato do not appear for the first time and the DGP fears a decline in ratings for this unprecedented occurrence. The Riders must play a game of Tag to capture Chirami, who reveals he was forced to be Game Master after running away. Meanwhile, Beroba and Michinaga are gathered at the Jyamar Garden as a plan is forming…

The Desire Grand Prix is now unable to continue following the incapacitation of the Game Master, who had his Vision Driver taken from him, thus canceling the mandatory Dezastar vote as well. What is this "Goddess of Creation" Beroba speaks of? Ace approaches Niram but... The only way to resume the Desire Grand Prix and have Ace's wish granted is to retrieve the Vision Driver. Following Niram's instructions, Ace and the others head to the Jyamar Garden. They are joined by Ziin who appears to help, and transforms with Ace into Kamen Riders to fight the Jyamato that stand in their way!

Due to operational troubles, the management of the Desire Grand Prix has hastily organized a Special Episode for the audience. For us viewers, the secrets of the Desire Grand Prix are revealed. Ace, Keiwa, and Neon also watch the Special Episode with Ziin and the other supporters, but the broadcast is suddenly hijacked by Beroba, and she has grand ambitions pertaining to the Jyamato!

When Michinaga enters the Jyamato Grand Prix, his best friend, Toru, who he thought was eliminated in the Desire Grand Prix, appears before him. To Michinaga's astonishment, Toru decides to work together to make his dream come true... Meanwhile, the first round of the Jyamato Grand Prix, the "Lightning Jyamato Festival" Begins. Even if they win, and cannot become the Deza Shin, they can't overlook the Jyamato attacking people. Ace, Keiwa, and Neon transform into Kamen Riders and fight Buffa and the Jyamato Corps. The game has begun that shifts the hunters to become the hunted...

In the Jyamato Grand Prix, during the Lighting Jyamato Festival, the Jyamato's goal is to build a lightning generator with enough power to completely level an entire town. While Ace is able to survive the onslaught of attacks led by Michinaga, the same cannot be said for Keiwa and Neon who are injured in the process, thus forcing Ace to fight alone. With the lightning generator now completed, Ace makes his stand as Geats against Michinaga and Toru. However he is seemingly overwhelmed by the combined might of both Kamen Rider Buffa and the Knight Jyamato.

The second round of the Jyamato Grand Prix has begun! The final goal of this "Sengoku-era Game" is to steal the Vision Driver from General Niram, the ninja Keiwa, and the swordswoman Neon, who face the Jyamato themselves. Michinaga transforms into Buffa and goes straight for Niram's headquarters, but Ace appears as a ronin to stop him as Geats Boost MarkII. He is able to overwhelm Buffa and protect the Vision Driver. Meanwhile, Ziin approaches Niram to get answers regarding the secret Ace's usage of Boost MarkII. Just what secrets is Ace hiding?

Ace barely escaped the crisis with the help of Tycoon and Na-Go. However, Ziin, who witnessed the crisis of Ace, was deeply hurt in both mind and body. Ace begins to talk to Ziin about his life so far... The Sengoku Game has been resumed! This time, Niram also decided to participate in the war, and Ace and others will fight while protecting Niram. Beroba transforms into Glare2 and it becomes a one-on-one battle with Geats!

The third round of the Jyamato Grand Prix is a "bullfighting game" created by Michinaga. Riders and Jyamato form teams and clash in one-on-one duels. The first team to reach three losses will be eliminated. On the other hand, Neon explodes with joy upon being able to celebrate her birthday with her fans. However Ace noticed her gloomy expressions following the end of her birthday livestream. It's almost Neon's turn to participate in the bullfighting game, but Beroba has a nasty trap waiting for her...!