With only two Watches left to collect, Sougo is on the verge of attaining the ultimate power, but when he is visited by the DenLiner’s Imagin quartet, he finds himself facing off with Sakurai Yuuto, who has witnessed Oma Zi-O’s future and intends to protect time itself!
Temporarily obtaining the Den-O Watch, Sougo holds the power of Grand Zi-O in his hand for only a moment before Yuuto interferes to protect the future from the tyranny of Oma Zi-O. Needing to stop Another Den-O’s rampage and the Mole Imagin, but without the DenLiner to travel back in time, Momotaros enlists the help of Geiz to travel back to 2017…
Takatora reports to Ryoma, Sid, and Yoko that Kouta will be working for them in hunting down the Overlords in an attempt to stop Helheim. They agree to the plan, but the next time they all enter the forest, Ryoma has set up a trap to take Takatora out of the equation.
The Rider Worlds have begun to merge, causing untold chaos as enemies from throughout the Heisei era run rampant! At the same time, the Ride Watches begin to turn to stone! Could the two events be connected? With Tsukasa’s help, Sougo and Tsukuyomi travel to Tsukuyomi’s own past to learn of Swartz’s true goal, while Woz and Geiz face-off with the Roadmude reaper himself, Machine Chaser!
The end of the world is underway as Tsukasa vows to destroy it himself, pulling the Riders to safety so that they can regroup. With the loss of the Riders, the various worlds have merged, giving Swartz the means to eliminate them all and save his own world. Despite his vow, Tsukasa refuses to abandon the people of Zi-O’s world and the four Riders come up with a plan, starting with Sougo facing Oma Zi-O once more in 2068 and planting the seeds for Phase 2…
While Sougo has chosen to remain fighting as Zi-O, this comes at a cost as the flow of time has suddenly been changed! Suddenly appearing before Sougo and the others appears Another Shinobi, who was created from the abilities of Kamen Rider Shinobi, a Rider from 2022 who shouldn’t even exist in this timeline’s history! On top of that, another mysterious Woz appears before Sougo and the others, and his motives are very different from the Woz they’ve known until now…
Hina and Eiji were both suddenly captured by Dan Kuroking! While working together with Hina, Eiji tries to escape, but Sougo stops them! Why is Sougo doing all this? And what is the future that Eiji told him about? Geiz, on the other hand, is now more confident than ever before that Sougo is on the path to become the future’s overlord…
After Tsukasa recovers the Faiz Gear, he learns Diend's reasons for wanting the belt before Takumi regains it so he and a shocked Yuri can escape on the Autovajin. However, as he exposed himself as the Wolf Orphnoch to protect her only to be forsaken, a saddened Takumi attempts to dispose of the Faiz Gear into the river. Managing to save the Gear while following him, Tsukasa returns to the photo studio where he put Yuri's confusion at ease. The next day, Daiki attacks Takumi to get the belt from him, nearly killing him when Tsukasa arrives with it. Refusing to take Tsukasa's words of something more precious than the Faiz Gear seriously, Daiki takes Decade's Ride Booker, and Narutaki takes advantage of the situation as he takes Tsukasa into another dimension to be killed by Kamen Rider Ryuga. However, after interrogating Kiva-la on the whereabouts, Daiki intervenes while claiming it was to get the Faiz Gear as he gives Tsukasa back the Ride Booker. While this occurs, the remaining Lucky Clover members start taking over the school to sire more of their kind until Takumi arrives to fight them in Orphnoch form. Though no match, Takumi attempts to protect Yuri's camera until Tsukasa arrives as he regains Faiz's Ride Cards. Decade and the Wolf Orphnoch are outmatched until Daiki arrives with the Faiz Gear and gives it to Takumi. The two transform and destroy the Dragon and Lobster Orphnoch. However, the Tiger Orphnoch revives his followers, and Decade counters with the Final Attack Ride Faiz Blaster, destroying him and his followers in one shot. As Takumi and Yuri rekindle their friendship, Daiki steals the Orga Belt from the ruins of the school, and Tsukasa follows him to the World of Agito.
Tsukuyomi has transformed into a Kamen Rider and the final battle has begun.
Sougo and crew are confused over the appearance of "White Woz"; Geiz and Tsukuyomi try time traveling to get the Kamen Rider Shinobi watch but are forbidden to land.
The megacorporation Dan Foundation declares independence from Japan as the head, Dan Kuroto, declares himself king of this tiny new nation! Sougo and the others go to investigate this new king, but they discover that the once-Kamen Rider Genm is now Another OOO! How did this happen?
Gai has taken over Hiden Intelligence and issued that all Huma Gear be scrapped.
Upon arriving in the World of Faiz and once more encountering the mysterious Daiki Kaito, Tsukasa finds himself in a school uniform and enrolled at Smart Brain High School. He learns that the high school is attacked on a nightly basis by beings called the Orphnoch, with only Faiz to protect the school. Daiki challenges Tsukasa to find out who Faiz is, and Tsukasa then challenges the Lucky Clover clique to a tennis match to see if any of them are Faiz. He beats them, learning that they are Orphnoch who are also after Faiz, and is forced to become Decade, using Blade's power against them. However, Decade is outclassed when Momose appears as the Tiger Orphnoch and warns him to back off. Daiki then confronts the group, giving them a hint as to who Faiz is before going off. Then, the Lucky Clover members target Yuri Tonoda and Takumi Ogami, believing Yuri is Faiz until Takumi transforms and fights them off. When Tsukasa learns that Yuri is the target, he goes off to fight the Orphnoch, watching Faiz get defeated and losing the belt. The fight is then interrupted by Daiki Kaito who transforms into Kamen Rider Diend while revealing he used the Lucky Clover to take the belt for himself. Once the Centipede Orphnoch is destroyed, Decade and Diend have a stand off over the Faiz Belt as Momose attacks Yuri as the Tiger Orphnoch only to meet his match with Takumi who transforms into the Wolf Orphnoch to protect his friend.
Arriving in the new world with a strange card in hand, Tsukasa finds himself in the costume of a kuroko before running into Daiki who just stole a squid-like artifact. Daiki mentions that this world is not like the other A.R. Worlds before running off prior to the appearance of mysterious red fish-like monsters. Tsukasa is about to transform before several other Kuroko show up along with five young men and women who transform into the Shinkengers to fight drive them back into the Sanzu River. Yusuke and Natsumi return to the Hikari Studio after losing sight of Tsukasa, with Natsumi worried about not being in an A.R. World. Tsukasa, however, is at the Shiba Clan household, listening in on a discussion between Takeru Shiba and his caretaker, Hikoma Kusakabe, over the latter's need to go to the hospital. Elsewhere, sushiman Genta Umemori catches up to Daiki, ready to fight him for stealing the Ika Origami. Both transform, and Diend summons both Kamen Riders Scissors and Raia to fight Shinken Gold. Unbeknownst to them, Bony Shitari sends the Ayakashi Chinomanako to investigate Diend out of dread of his appearance. Chinomanako arrives just as Shinken Gold takes out the summoned riders and steals the Diendriver from Daiki, knocking out Shinken Gold in the process. Chased by the Ayakashi, Daiki makes his way to Tsukasa who laugh at the irony before using Den-O's power as Decade to fight Chinomanako. The Ayakashi escapes at the last minute, and is suddenly compelled to use the Diendriver, inserting the Diend Kamen Ride Card and shooting it above him. Transformed into a monstrous version of Kamen Rider Diend, Chinomanako summons a mass of Nanashi to attack the mortal realm to Narutaki's horror of the newly born abomination.
Kouta starts to gain a reputation in Inves Games by fighting them as Armored Rider Gaim, when Kumon Kaito reveals he too has a Sengoku Driver and the Banana Lockseed, beginning a new chapter for the Beat Riders and the Inves Games…
Shinnosuke must deal with both Chaser and the Paint Roidmude, as Rinna reveals to him the secrets to Asaya’s paintings.
Ark sends Naki to pay a visit to Gai; the vice president of Hiden enacts a plan to take back the company.
Sakura engages with Vail when he turns his attention to Hana, whom he sees as Sakura's weakness; Tamaki is tested by Weekend.
At his new company, Aruto is tasked with bringing back the Huma Gear, G-Pen.
Using Ryuki's powers, Decade battles Gyuki while Ibuki and Zanki argue whose fault this was. When Akira and Todoroki join the fray in their Oni forms to save Asumu as he tries to protect them, with Decade joining them by using Den-O's Ax Form, they manage to defeat Gyuki. He runs off before regressing to Hibiki, and Yusuke and Natsumi find him shortly after. Later that night, after talking to Asumu, Akira and Todoroki confront their mentors to put aside their differences, with Tsukasa supporting them. Ibuki and Zanki promote them to the role of new teachers of their respective schools. Meanwhile, Hibiki reveals the nature of Gyuki to Yusuke and Natsumi as Daiki arrives to claim the last scroll. Hibiki stops him and gives Daiki his Onsa to give to Asumu with a final request. The next day, after suffering a Narutaki-induced vision of the future resulting from their actions, Natsumi finds Daiki, who uses Asumu as his cover to steal the final scroll. But as Tsukasa arrives, Daiki evokes Hibiki's final change into Gyuki to Asumu's horror, and the thief leaves them. After learning the secret of the three scrolls to be all schools as one, Daiki returns to give Asumu the Onsa. Asumu becomes Kamen Rider Hibiki in order to honor his mentor's final request: slay the Makamou to free Hibiki's soul. However, Narutaki arrives on a giant Bakegani (summoned with the help of Kamen Rider Ouja), with Todoroki and Amaki showing up shortly after. Once Diend destroys the scrolls, revealing that the true Ongekidō is all three styles in harmony, Decade regains Hibiki's powers. Decade, Diend, and the Oni all finish the Makamou off together. After Asumu and company thank Daiki for uniting the schools, Tsukasa and company return to Natsumi's world with Natsumi a bit worried.
Kouta and Kaito split up, each after their own goal in the Helheim Forest. Kaito begins collecting Lockseeds to further his power in Zawame, while Kouta searches for the missing Yuuya, but finds himself in battle against a greater enemy: a white Rider. Meanwhile, with Kouta missing as well, Mitsuzane approaches Sid, demanding his own Sengoku Driver…
As Mitsuzane is about to kill Kouta, Takatora appears and stops him, revealing the two’s relationship as brothers to Kouta. Later, the fight between the two brothers begins as Takatora returns as Zangetsu to fight Mitsuzane. But, can Takatora strike a final blow against his own younger brother?
Aruto and Izu deliver a new Huma Gear to a famous manga artist and believe that he has lost his passion.
The Ark takes over Horobi's body and sends Yaiba to the hospital; Fuwa struggles with now knowing that his family is not dead.
Horobi gives Jin permission to go after one of Zero-One's Progrise Keys, but he freezes up when confronted a Huma Gear and her father.
Kouta tries to overcome the events that befell him in the Helheim Forest against the white Rider while Kaito challenges Mitsuzane to a fight, with the new Armored Rider Ryugen unable to fight Baron on his own.
Touma and company plan to sneak into the Southern Base to meet with Master Logos.
Ogami receives some needed advice from his son; Reika blatantly lies to the swordsman about Master Logos' words.
Having managed to fuse the Lost Bottles and the white Panel, Sento unlocked the bridge to the new world, but Banjou sacrificed himself to force Evolt into the rift! Sento steps up one last time, to save his friends and the world, but will the world remember him for his heroism, or will Kiryuu Sento be forgotten forever?
After Tsukasa reveals himself, Takeru realizes that Tsukasa is the "Decade" Narutaki warned him about. Before the two can fight, Narutaki arrives to tell Tsukasa he is to blame for the terror brought unto the world by the Ayakashi Chinomanako who now has the powers of Diend, and that the only way to save the worlds he entered if he ceases to exist. After Takeru takes out the Nanashi and drives off Chinomanako as Shinken Red, Genta attacks Tsukasa believing that he is in league with Daiki until Natsumi takes him to the Hikari Studio, where Hikoma Kusakabe is hiding. When the other Shinkengers arrive, Daiki uses their fears to cause a fight to break out and escapes with Genta not far behind, leaving Natsumi to break it up before going to a room where all of Tsukasa's photos are kept. When Chinomanako attacks again, Genta ends his chase and contacts the Shinkengers who go off to fight the Ayakashi Rakider alone. Tsukasa, troubled by Narutaki's words, stays behind with Yusuke trying to convince him to help before he goes off on his own. By then, Hikoma comes forward and convinces Tsukasa to continue to find his place, regardless of what Narutaki has said to him. Tsukasa joins the battle just as Chinomanako and his summoned Eagle Undead and Moose Fangire have overpowered the Shinkengers and Kuuga. Decade and Shinken Red fight Chinomanako, who has summoned Kamen Rider Blade to fight with him. The other Shinkengers and Kuuga manage to destroy the Eagle Undead and Moose Fangire as Decade becomes Complete Form and uses the powers of Blade King Form to attack Chinomanako. Using the Blade Final Form Ride Card, he transforms Chinomanako's Blade into the Blade Blade before switching weapons with Shinken Red to use active Rekka Daizantou Attack Ride Card to destroy Chinomanako, saving the world. Daiki shows up just in time to snatch the Diendriver back, only to be thwarted by Shinken Gold who forces him to give back the Ika Origami in exchange for the Diendriver, and then everyon
Ankh threatens to leave OOO for Kazari and the Greeed while investigating the evolution of humanity while Eiji tries to find more about Hina.
Kaito meets DJ Sagara, who provokes him and summons a ghost-like Gaim Zenith Arms for Kaito to fight in order to experience Kouta’s true level of power. After the battle, he gets caught up in an alternate world where he leads Team Baron in the competition for soccer’s All Rider Cup.
The police learn of Aruto's secret lab when a Huma Gear detective shows up to help solve the case.
Build, Grease, and Cross-Z are all unmatched against the threat of Kamen Rider Rogue! Just then, Misora appears, eyes glowing green! Sento witnesses something incredible that begins the search behind the origins of Misora’s bangle. Something truly unbelievable is going on here…
With Rogue’s theft of the box, Seito demands Touto’s surrender and their Fullbottles but agrees to a series of proxy battles with the Riders to decide things. As Kazumi trains with Ryuga, Sento prepares a new upgrade for Build, inspired by his experience with Misora’s power while in Hazard Form…
Katsuragi Shinobu is working alongside Evolt and helping create the ten Lost Bottles needed to power the black Pandora Panel! Despite this, Sento puts his faith in the Rider System he finished, but his resolve is tested when another Build appears in front of him!
A man working at his family's bathhouse discovers that there is a demon living inside of him that only he can see.
A young writer possessing a strange book comes face-to-face with a monster using books for evil.
Ankh becomes troubled when Eiji prevents him from eliminating his possessed body’s sister while another Greed uses a man’s gluttony to create more Medals.
Although finally restoring himself, Ankh retakes Shingo’s body and decides to start collecting Medals for himself even as Eiji tries to stop him.
In the forest, Takatora is saved by the Overlords and introduced to their leader, Roshuo, who tells him of their past as the Femushinmu people and the secrets of Helheim. Later, Kouta, Kaito, and Mitsuzane all search the forest for Sid, but Sid has set a trap for Kouta.
Roidmude 008 has started his move! Intent on obtaining Super Evolution, he has started kidnapping women driving cars. Drive and the Unit give chase but he is too fast and it is hard to keep on his tail. They decide to try a sting operation by impersonating a couple in a car. This makes Chase react, since he is, right now, in the process of obtaining a driver’s licence. Meanwhile, Mr. Belt confronts Go after Heart told them of Professor Banno’s existence. The professor, saying “It is about time.”, reveals himself to Mr. Belt and also informs Kiriko that he is her father…
Go believed that if Krim Steinbelt and Banno joined forces, the Roidmudes could be eliminated. However, he was betrayed by none other than Banno himself. After being attacked, Mr. Belt is stolen from Shinnosuke and kidnapped by the mysterious Roidmude 004. Heart speaks to the now despairing Go and Shinnosuke, explaining what happened between him and Banno, who he calls “the lowest of humans”, in the past. Meanwhile, Chase is after the Tornado Roidmude, who has kidnapped Kiriko.
Touma pleads for Kento to fight with the other swordsmen as they battle Master Logos.
Arriving in the last world, the World of Hibiki, Tsukasa and company begin the search for Kamen Rider Hibiki when they are ambushed by the Makamou Kappa. An Oni in training named Asumu battles the monster until Decade uses Kabuto's powers to destroy it. On learning he is Hibiki's pupil, Tsukasa has Asumu bring him to his mentor. Upon seeing Tsukasa, Hibiki, who is shirking off from his duties as an Oni, believes him to be the legendary Ongekidō Grand Master. Meanwhile, Zanki slays a band of Bakeneko as Ibuki arrives to take them out as well. But when the last Bakeneko escapes them, Decade destroys it with the two groups as witness. Tsukasa visits Ibuki's school afterwads and talks with Ibuki and Akira about three special scrolls. Meanwhile, after failing to rob Hibiki as he takes his leave, Daiki is forced into becoming Asumu's mentor. Like Tsukasa, Daiki learns of the three scrolls of the Oni classes, and he convinces Asumu to become Hibiki's pupil again, before taking his leave to Zanki's dojo where he offers a proposition. Returning to find Hibiki and Asumu attacked by a Tengu, Kuuga attempts to battle the Makamou. At the same time, Natsumi encounters Narutaki as he reveals Tsukasa's actions actually doomed the worlds rather than saved them. When Kuuga is nearly killed, Hibiki assumes his Oni form to destroy the Tengu before he suddenly transforms into the monstrous Gyuki. While this occurs, the Ibuki School and Tsukasa receive a challenge from Zanki's School and Daiki with the scrolls on the line. With them representing the two Oni schools, Decade and Diend do battle. But once Diend reveals his intentions to steal both scrolls, he summons Momotaros who attacks the Oni Kamen Riders until Gyuki storms in and overwhelms the Oni. The episode ends with Decade using Ryuki's powers to take on the Makamou.
With Kazumi’s defeat, Evolt appears before the remaining three Riders as the final battle for the fate of the Earth begins! But, when Evolt gains the upper hand against them, Gentoku puts it all on the line in a last-ditch effort to stop Evolt once and for all!
Ikki is asked to go undercover by a talent agency when George sends him a new stamp to help out Vice.
As tension builds within the team over Sento’s belief that his father hasn’t truly sided with Evolt, Misora is kidnapped to unlock the next Lost Bottle, and Shinobu reveals that thanks to Vernage’s power within her, Misora can’t be saved by the power of Genius! Can Sento formulate a plan to save Misora?
Shinnosuke and Kiriko are sent to investigate an art gallery where there have been rumors of women’s ghosts being eaten by a monster, but when they arrive they find the owner refuting the rumors. Shinnosuke investigates the gallery only to be hit by a Density Shift as a Roidmude targets Kiriko.
The hermit informs Takeru that the next hero he should seek out is Billy the Kid, and that it will be near one of his close friends. However, Takeru instead finds Makoto Fukami and he confronts him on what his true intentions are.