Kakogawa Hiryuu rules over the world as Geiz attacks Sougo, bent on destroying Zi-O, without realizing that Another Zi-O II is his real enemy! Knowing the promise his friend made once before, Sougo cancels his transformation in the hopes of jogging Geiz’s memory. Meanwhile, Kaito Daiki returns in search of a new treasure from the twisted world, bringing him into the service of Swartz…
As Gaim and Hell Ryugen continue their battle, Kaito realizes that there is only one way for him to surpass Kouta now that he possesses the powers of the Overlord King. As Ryoma disables the remaining Genesis Drivers other than his own, Kaito takes his plans to the next level, at the risk of his humanity…
Just who is this Another Zi-O and Kakogawa Hiryuu?! Sougo struggles with who he is as Hiryuu stands before him with a clearly hostile intent! Meanwhile, Tsukuyomi travels back in time to the year 2009 in order to discover the connection between them! And finally, the time comes for Geiz to awaken the power to defeat Zi-O!
Kyousuke has been outed as not being Hibiki; Sougo has Todoroki take Woz as his pupil for the day.
With Tsukuyomi in a coma due to Another Wizard’s sleep spell, Geiz angrily tells Sougo off and heads out to find a way to save her by tracking down the man with the Ride Watches he saw. In a park, he comes across a man camping, realizing it’s the man he’s after, but as Sougo battles Another Wizard, Geiz faces off with a Legend Rider!
After Hase transforms into an Inves, Gaim tries to take him out before he can do much damage but finds it difficult to harm someone who he believes is still human inside. Meanwhile, Baron does his best to combat Zangetsu Shin, but is overcome by Kurokage Troopers and captured. And Mitsuzane, who realizes his brother is their foe, infiltrates the Yggdrasill headquarters on his own to see what is truly going on…
It's Sougo's birthday and Woz wants to make it special; Sougo's former classmate who wanted to become an oni is turned into Another Hibiki.
While celebrating Kengo’s birthday, the Horoscopes have located their final member, Pisces, in Ran Kuroki, who has been given the chance to study abroad in America. But after Leo attacks, Hayami gathers the Kamen Rider Club to tell them the truth of what has been happening and prevent Ran from becoming the final Horoscopes.
Kouta tries to prove that he has not changed, despite all Kaito has seen in Helheim, and helps the others clear Zawame of Inves. However, Mitsuzane and Ryoma discover that Mai, who has been taken ill, is now the host of the golden fruit, and wonders why Roshuo placed it in her.
When Sougo and the others hear of a popular magic show, they set out to check it out, but the magic they see doesn’t seem like mere sleight of hand. But as Geiz recalls a Kamen Rider who harnessed the power of magic, he confronts the magician, who quickly reveals his true form!
With Sougo's soul separated from his body, he guides Takuru back to the year 2015 where Geiz has his Ghost watch taken from him in exchange for a Decade one.
After being defeated by Oma Zi-O, Sougo arrives back in 2019 where all his friends have turned against him and his only ally is a passing through Kamen Rider.
Sougo and Geiz head into battle with an Another Rider when the original Rider also arrives on the scene. How are both Kamen Rider Quiz and Another Quiz active at once?
Captured by Swartz, Tsukuyomi learns of her forgotten history, including a shocking connection to the Time Jacker himself! While she wrestles with the truth, Geiz and Sougo search for her, but instead run into Ora and Heure, who have been betrayed by Swartz!
Roshuo begins the invasion of the Earth by opening cracks around the world. Kouta, Kaito, and Yoko plan an assault on the Yggdrasill tower to stop him, while Kouta also seeks out Akira. However, Mitsuzane has other plans after seeing Mai again.
Mai wants to know why Kouta has been hiding from her, and he reveals the truth to her about Helheim Forest, as well as the Inves and the fate of Yuuya, upsetting Mitsuzane, who is still under orders from his brother. Meanwhile, Kaito plans to finish his fight with Demushu, thanks to a new gift from Ryoma.
Another Riders that should have been defeated start to appear again one after another! Furthermore, they’re going after the people the Time Jackers contracted them with! Does this mean that whoever is behind this is harnessing the powers of various Another Riders? Sougo, who sets out to investigate this situation, encounters Another Zi-O, the overseer of the Another Rider’s powers! Also, the young man who transforms himself into Another Zi-O seems to be vaguely familiar…
With Kouta and Kaito both captured by the Yggdrasill, they are brought to Sengoku Ryoma who reveals that he created the Sengoku Drivers and Genesis Drivers, and reveals the truth about the Forest of Helheim to them. While under Yggdrasill’s custody, Kouta is approached by DJ Sagara who tells him more of the truth behind the Yggdrasill and suggests that he do something about it.
An Another Rider suddenly appears in the city, striking people down and taking their souls away! Tenkuji Takeru and Narita of the Supernatural Phenomenon Lab set out to capture this Another Rider, but there seems to be a different Kamen Rider in the mix!
Eiji gets to the root of Takeshi and Momoko’s issues involving greed and loss of ambition while Ankh fights for survival after a failed confrontation with Uva.
Ran refuses to hand over her Pisces Zodiarts Switch that will finalize Gamou’s plans, so he sends Tatsugami to take her Switch. Elsewhere, Kengo discovers a secret from the USB drive he found in the late Emoto’s office.
Kouta is knocked unconscious by Ryugen’s backhanded attack, and Baron fights Ryugen for acting so cowardly. Meanwhile, Takatora mulls over the idea of having to cull the Earth’s population down to only one billion people through the use of the Sengoku Drivers, remembering back to the days of first developing them, unaware that even then Ryoma was conspiring against him. When Kouta regains consciousness, he explores Helheim once more, only to be approached by someone unexpected…
With the world falling into chaos thanks to Ryoma, Zawame City has become an isolated place infested with Inves. Kouta’s sister Akira, along with others in shelters, go outside to call for help. Meanwhile, Redyue broadcasts an announcement over the radio to the whole world stating that Helheim will completely take over the Earth in a year. At the same time, Inves are commanded to hunt the citizens of Zawame City.
Genta takes refuge with Weekend; Sakura wants to return a suicidal Aguilera to life as a normal human.
In order to make Geiz the savior of the future, and deprive Kamen Rider Quiz of his powers, White Woz starts a fight between Zi-O and Geiz while Quiz faces his own father, Another Quiz in battle! And still, this raises yet another problem…
Hase and Jounouchi transform into Armored Riders Kurokage and Gridon, but something strange happens during their fight with Baron against Gaim and Ryugen. Later, Kouta tries to get a part-time job at a pastry shop, only to be run off by the owner…
Touma tries to find a way to save Yuki; Rintarou and Daishinji see Touma protecting a Megiddo.
To celebrate their mother being released from the hospital, the Igarashi family gets out for a family vacation.
hen Aruto is hospitalized, Izu rallies the Huma Gear to fix his Zero-One powers.
Gentarou and the others protect the prom for their friends who are graduating, while Miu and Shun deal with the fact that they won’t be part of the Kamen Rider Club anymore as they are going to college.
Takeru Tenkuji strives to be a Ghost Hunter just like his late father, Ryu. On his 18th birthday, he receives a Ghost Eyecon as a present from his late father's spirit. However, a mysterious monster appears, demanding that Takeru hand the Eyecon over. Takeru boldly confronts the monster, but...
Takeru tries to figure out the intentions of the mysterious other Kamen Rider when he investigates gunfire at a local school.
Touma is depressed from losing his companions while the Sword of Logos are torn on whether to trust Touma.
Ikki learns of a Deadman that is running around with a group of thieves; Daiji wakes up on the floor with no memory of how he got there.
Now that the Deadmans are falling apart, the Igarashi siblings vow to be stronger than ever.
Aruto teaches Izu and Subaru about family when A.I.M.S. unleashed an assault on MetsubouJinrai.net.
Part 2 of the "Spring Break Combined Hero Festival". Akari and the others cannot believe that Makoto, who saved Alain from harm, was only an Eyecon. Takeru, now knowing that Makoto’s body is in the Gamma World, intends to go but the others stop him. Kanon offers Alain’s help but Takeru does not trust him. After witnessing this, Kanon goes by herself to convince Alain. Sightings of a Mouse Monster have been reported. It seems to be different than a Gamma. On top of that, Goemon’s ghost has possessed Onari. Alain is still the target of assassins and he still cannot get used to a flesh body and the fear of death. As Takeru's troubles pile up, a red warrior who once fought by his side appears to lend a hand.
Now that Sento has returned and Genius Form has been perfected, Evolt faces a new, unexpected wrench in his plans. His next step: collecting the rest of the Lost Bottles, including the three formerly belonging to the Hokuto Trio, now held by Kazumi. Meanwhile, Gentoku returns, but is he all right?
After Aruto uses his bike outside of work hours, a pair of Huma Gear from Satellite There pay him a visit.
Eiji tries to research a husband bullied by his wife over money while Ankh follows a lead for a missing Core Medal.
Mitsuhide Nira of the 1st Division pays a visit that leaves an unpleasant taste in the Special Unit. Meanwhile, a Roidmude targets Hayase, Shinnosuke's former partner. When things get out of hand, Shinnosuke has no choice but to reveal his identity as Drive to the public.
With all fifteen Eyecons gathered, Saionji barges his way into Daitenkū-ji to the Monolith to demand the ability to take over the world. However, Takeru is taken into a giant mandala called the Great Eye that has appeared in the sky and is asked one question by a disembodied voice: "What is your wish?"
With the battle concluded, Seito seizes control of Hokuto orders Kazumi and the others to serve Seito as their weapons or else their friends and families will suffer. Banjou wants to take the fight to Hokuto, but Sento stops him, reminding him that they can only defend Touto, and setting up a plan to allow Grease to bring the fight back…
With Lovekov not listening, Sakura decides to take Aguilera out for some fun before their battle; Daiji brute forces his way in his search for the doctor.
Katsuragi’s father is still alive? Using the data recovered by Ryuuga, Sento begins looking into the truth of the Best Matches, but Misora seems uncomfortable with this. Meanwhile, Sawa uncovers a connection to the people turned to Smashes and the Riders, leading Sento to confront a man who was his father’s assistant…
The Gammaizers, incorporating the Great Eye, appears in the human world from the Gamma World. Takeru chases after the Great Eyezer. Takeru transforms into Ghost Mugen Damashii and stands up to the Great Eyezer to have his attacks repelled. The Great Eyezer that triumphs then grows huge and becomes a giant. The Great Eyezer then starts to suck up everyone in the city. Although Takeru is despaired by "not being able to protect everyone's future" and has a sense of helplessness, he remembers the love his father and mother gave to him and he wakes up to this power of human love. Takeru then transforms into Ghost Mugen Damashii again and uses "Love Bomber" to disrupt the Great Eyezer giant, thus weakening it and shrinking it back to normal size. Aligning the heroes and the power of 15, he defeats the last enemy! Takeru transforms into Ghost Ore Damashii and defeats the Great Eyezer once and for all! Takeru not only uses his wish to return the taken people and the people of the Gamma World but is also revived! Akari and friends are overjoyed and everything is back to normal!
Chiharu comes to Aruto in search of a Huma Gear that can find her a husband.
Emu is focused on bringing Poppy back to her original state. After restoring back Poppy's memory by using Maximum Mighty X's reprogramming ability, she tells Emu that she was born by possessing a human being.
With Pandora’s Box in Faust’s control and Sento’s injuries sidelining him, Banjou is tapped to use the Build Driver now that he has reached Hazard Level 3.0! But, before he can transform, he has to find the secret to synchronizing with the Cross-Z Dragon…