While in Zawame's Free Performance Zone, Mai and Mitsuzane of the dance team Team Gaim are having a free-spirited dance when members of rival Team Baron scare them away when an Inves Game gets out of hand. When Mai goes to former teammate Kouta Kazuraba to reveal something strange has happened, he reveals that Team Gaim's leader Yuya gave him a strange Lockseed, and Mai reveals Yuuya informed her of it as well. The two eventually find a way into the Helheim Forest that has appeared in the Free Performance Zone.

Kouta tries to use his new abilities as Kamen Rider Gaim to help out at his part-time job, but he only gets in the way. And when Yuuya mysteriously disappears, Kouta wonders if what happened in the forest was real, and now that he is in charge of Team Gaim, he must lead the group in a dance-off against Team Baron.

Kouta starts to gain a reputation in Inves Games by fighting them as Kamen Rider Gaim, when Kaito Kumon reveals he too has a Sengoku Driver and the Banana Lockseed.

Kouta and Kaito work together to try to find Yuya, but they instead face off against an even more terrible enemy.

Kouta tries to overcome the events that befell him in the Helheim Forest against Zangetsu while Kaito challenges Mitsuzane to a fight, with the new Armored Rider Ryugen unable to fight Baron on his own.

Hase and Jonouchi 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 disturbed by the effeminate head chef.

After easily defeating both Kurokage and Gridon, Kamen Rider Bravo steals their Lockseeds and sets his sights on defeating all of the Armored Riders. Kouta is angered that Oren has made it his mission to defeat all of the Armored Riders, but Kaito just tells him to beat him to get it over with. Before long, Bravo issues a challenge to Baron, but it is not Baron who he is really after.

After his defeat at the hands of Bravo, Kaito believes he is no longer strong enough and seeks out a new strength. While Kouta seeks out a new job, Mai finds herself trapped in the Helheim Forest again, forcing Kouta and Mitch to go and rescue her.

Kouta and Mitsuzane must hunt down a fully manifested Inves that is randomly attacking people in the city while also dealing with keeping up their Beat Rider ranking.

Kouta and Mitsuzane begin to postulate on the identity of the white Armored Rider who seems to be destroying all evidence of the Inves entering their dimension. To try to figure out what should be done about both the Inves and the white Rider, Kouta decides to consult with the other Armored Riders

As the Lockseed gathering "game" begins, Baron and Bravo fight between themselves, while the white Armored Rider, Kamen Rider Zangetsu, investigates the infiltration into Helheim Forest. Meanwhile, Kouta, who has also entered the forest, decides to track down the white Rider and finds the base of operations that may be the cause for the tears into Helheim Forest opening on their own.

Kouta and Mitsuzane attempt to warn the Beat Riders about Yggdrasill's manipulation, only to find that Yggdrasill is deploying Kurokage Troopers to silence anyone who knows the truth as Zangetsu uses a new belt model. Meanwhile, Mai encounters the mysterious girl who resembles her.

A mysterious bacteria is infecting people in Zawame City. In the crisis situation, Kouta, Mai, and Mitsuzane try to find out the cause behind this.

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 the white Armored Rider, infiltrates the Yggdrasill Corporation headquarters on his own to see what is truly going on.

With Kouta and Kaito both captured by the Yggdrasill Corporation, they are brought to Ryoma Sengoku who reveals that he created the Sengoku Drivers and Genesis Drivers, and reveals the truth about the Helheim Forest to them. Elsewhere, Mai and Zack try to convince the other teams to hold off the Inves Games due to the damage they cause and how they are missing most of the Team Leaders. While under Yggdrasill's custody, Kouta is approached by DJ Sagara who tells him more of the truth behind the Yggdrasill Corporation, and suggests that he do something about it.

After escaping the clutches of the Yggdrasill Corporation, Kouta wonders why all three of them were able to escape so easily, knowing how Ryoma Sengoku was interested in them. Later, Mai and Chucky continue to try to convince other teams to end the Inves Game, but they instead witness an Elementary Inves robbing a jewelry store. Meanwhile, Takatora has shown Mitsuzane a horrible scene hidden within the Helheim Forest and revealed that he easily beat Kouta.

After Takatora reveals the truth about Helheim Forest to Mitsuzane, he tasks his brother with recovering Kouta's Sengoku Driver. Elsewhere, Oren and Jonouchi plan to perform the same act with their own plan in mind. Kouta later receives a phone call that tells him his sister has been kidnapped.

Mai tries to host a dance contest to bring everyone's morale up, but none of the teams will participate. Mai tries to get Kouta to convince Team Baron to join, but he is not sure that he will dance either. It is only the appearance of Oren who changes the minds of the others, as he turns their friendly dance competition into an outright fight.

Duke fights against Gaim and Baron and manages to come out on top. As they lick their wounds, DJ Sagara appears and gives Kouta a present in the form of a Tulip Hopper Lockseed. When they arrive in the Helheim Forest, they are quickly surrounded by Yggdrasill, pressuring the two Beat Riders to fight to stay alive.

Takatora shows Kouta the truth behind Helheim Forest, at the same time Kaito would learn the same thing from Ryoma, Sid, and Yoko. Meanwhile in Zawame City, more Inves invade and it's up to Mitsuzane and Zack to stop them.

The Helheim Forest will soon destroy the Earth if no one acts on it. Kouta informs Mitsuzane about this fact and says they must do something, but Mitsuzane is hesitant as he already knows the truth. Meanwhile, Kaito examines a photograph taken from within the Helheim Forest and believes he sees a human figure, then goes into the forest to investigate.

The Crack at Yggdrasill's lab causes more and more Cracks to appear throughout Zawame. Kouta believes the solution is to close Yggdrasill's Crack before any more Inves can attack. However, Kouta encounters Ryoma and Yoko waiting for him in Helheim Forest, ready to stop him so their plans may continue.

Now aware that he killed Yuya, Kouta loses all will to fight, and will not even seek to destroy the Scalar System. As he struggles with the thought of telling the truth to his friends, Kaito encounters the strange Inves in Helheim Forest, once more.

Baron continues to attempt to defeat the Over Lord Inves to no success, until Marika suggests a new plan. Mitsuzane tries to get Kouta, now that he has the Peach Energy Lockseed, to track down the Over Lord Inves, while also finding out that DJ Sagara has been helping him all this time, leading him to wonder who Sagara really is and what his plans are.

After watching Kouta, Mitsuzane, and Zack battle Inves, Jonouchi realizes that the dance team days are over, again. Later, Oren arrives to begin Jonouchi's next set of training. Kaito tries to tell Kouta about the Over Lords, while DJ Sagara is confronted by Ryoma, Yoko, and Sid. After Gaim, Bravo and Gridon fought the Inves that appeared Oren and Jonouichi goes home but Jonouichi reveals to Oren that the Inves Game is no more. Later, Oren finds a crack and tries to investigate it but discovers something yet to be revealed.

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 Yuya, upsetting Mitsuzane, who is still under orders from his brother. Meanwhile, Kaito plans to finish his fight with Demushu.

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 Forest once more, only to be approached by someone unexpected.

Takatora reports to Ryoma, Sid, and Yoko that Kouta will be working for them in hunting down the Over Lords in an attempt to stop Helheim Forest. They agree to the plan, but the next time they all enter Helheim Forest, Ryoma has set up a trap to take Takatora out of the equation.

In the forest, Takatora is saved by the Over Lords and introduced to their leader Rosyuo who tells him of their past as the Femshinmu 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. Then Kouta fights with Zangetsu Shin in Helheim Forest, unaware that it is actually Mitsuzane attacking him using his brother's weapons.

Kouta and Mai meet a young man who can remember nothing about himself other than his name, Jiro. During a rain storm, Kota tries to pull Jiro out of the rain, but noticed his hand feels like metal instead of skin, bringing up the question if Jiro is a robot. Elsewhere, Ryoma looks over the schematics for an android developed by a colleague. Its model name is Hakaider.

The "Fruit of Knowledge" gives someone the power to remake the world itself and become God. Sid overhears from one of the Over Lords, Redyue, that Rosyuo has been safeguarding the fruit. Sid plans to steal it so he can become God. While this unfolds, the Over Lord Demushu has left Helheim to invade Zawame City and begins to randomly destroy the city.

Baron Lemon Energy Arms and Knuckle cannot hold off Demushu forever, and he escapes them. With Sid murdered at the hands of Rosyuo, he instructs Redyue to continue the invasion of Zawame much to Takatora's shock and terror, while Mitsuzane seeks out the Fruit of Wisdom still. Elsewhere, Kouta wakes up, and DJ Sagara presents him with something that will help him out.

The Inves are invading, Kouta's sister takes shelter, and Kouta patrols with the others. Trying to get the Golden Fruit, Ryoma reveals Project Ark to the world, which erupts into chaos. Then, without help from the Japanese government or Yggdrasill, Kouta and the other Riders lend a hand to the people left behind.

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.

Yoko confronts Mitsuzane about his actions as Zangetsu Shin and whether or not he will tell Kouta, while Redyue plans on using human technology to further her own goals as well as bring back Rosyuo's queen. But to do that, Redyue requires a sacrifice.

Rosyuo 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.

As Mitsuzane/Zangetsu Shin is about to kill Kouta, Takatora appears and stops him, revealing the two's relationship as brothers to Kouta. Later, the fight of the two brothers begins as Takatora returns as Zangetsu to fight Mitsuzane.

Kaito meets DJ Sagara, who provokes him and summons a ghost-like Gaim Kiwami Arms. 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.

Mitsuzane seems to be hallucinating, claiming he can see Takatora even though he knows he defeated him. Elsewhere, Ryoma returns to Zawame City, and Kouta believes he may now be an ally against Mitsuzane and the Over Lords.

Kouta and Ryoma work together to break into Yggdrasill Tower to free Mai and Akira.

Kouta follows the passage to Yggdrasill Tower and to his surprise discovers an underground dungeon. Redyue informs Kouta that he has become one of the Over Lords, rather than a human, and proceeds to show him his apparent destiny.

Kaito fights with Mitsuzane but the two are disrupted by Ryoma. Meanwhile, Mai talks to Rosyuo and is entrusted with the Forbidden Fruit before entering a fight against Kouta and Kaito.

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 Rosyuo has placed it in her.

As Gaim and Ryugen Yomi continue their battle, Kaito realizes that there is only one way for him to surpass Kouta now that he possesses the powers of the Over Lord King.

As Mai accepts the powers of the Golden Fruit and attempts to change the fate that has befallen her friends, Kaito seeks her out to gain its power, as well.

Zack sets a trap for Kaito, but...

Meanwhile, Kouta has gained command over an Inves army whilst battling Kaito.

Betting their lives and beliefs, Kazuraba and Kaito finally face off.

Seven months after Kouta and Mai have left and colonized a new planet, all traces of Helheim Forest have been cleared from Zawame City, but a returning threat appears to change things forever. Mitsuzane realizes that Kouta isn't on Earth anymore and that it's up to them to save Zawame City.

Sougo Tokiwa seems like an ordinary high school student, but one thing he has different is that he has dreams of becoming a king! One day, a mysterious young man appeared before him with a prophecy. "Congratulations! Today is a special day for you..." As Sougo is told these words, a giant red robot suddenly appears before him! This robot was a time machine, and Sougo was thrust across various timelines! In the year 2000, the battle of the Heisei Rider's fate, and Sougo's fate in his own birth year, is about to begin...!

The man who hails from the future, Geiz, attacks Sougo! Tsukuyomi, a girl who also hails from the future, came to help out Sougo, but Sougo has absolutely no idea what's going on! A mysterious prophet named Woz is also starting to appear frequently before Sougo. The creature, Another Build also attacks. What could be the key to defeating this "Kamen Rider Build"? Sougo makes his way towards the Nascita Cafe to meet with Kiryu Sento...

A strange collaboration between Geiz and Tsukuyomi happens with Sougo in the year of Build, 2017. They both decide to go to Sougo's school to keep a closer eye on him. While there, they discover a growing popularity of a "game that no one can clear" with the other students. Rumors surrounding the Genius Gamer M start to surface as well, as they decide to chase the mystery by finding him. And Sougo and the others end up meeting...? Suddenly, a new Time Jacker, Ora appears!

Ora has given a father the power of Another Ex-Aid as part of a bargain for his son's life. Geiz and Sougo travel back to 2016 to help him.

Tsukuyomi and Geiz learn that 18-year-old Libras have been going missing from Amanogawa High for years and want to check it out, thinking that it's probably an Another Rider plot; Schwartz makes his presence known to Uhr and Ora, forcibly creating a new Another Rider.

Takumi joins Sougo in protecting Karin from Another Fourze; Tsukuyomi and Geiz learn that Karin is actually much older than she looks.

Sougo learns of a magic show and wants to check it out. After seeing the magician in action, Geiz believes that he might have been given the powers of Kamen Rider Wizard and wants to fight him.

Geiz tracks down Kousuke in order to get his hands on the Wizard Ride Watch.

Uhr gives Kuroto Dan the powers of Kamen Rider OOO, which leads to Kuroto declaring himself king in 2018. Sougo finds common ground with this new Kuroto and wants to learn from him.

Sougo asks Kuroto just what type of king that he wants to be; Tsukuyomi learns to listen to all points of view.

Sougo and Tsukuyomi search for Geiz when Sougo notices the news that Team Baron dancers have been disappearing, but Tsukuyomi gets fed up with Sougo constantly returning just after leaving and having an inconsistent memory.

Sougo is revealed to have traveled back in time to save Geiz, and so there are two of him in the present, but Woz isn't very keen on this plan.

Takeru Tenkuuji and company have been hired by a woman to investigate Another Ghost after her brother mysteriously disappeared; a confrontation occurs with what appears to be Kamen Rider Agito.

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.

Oma Zi-O sends a fleet of Dai Mazine to 2018 and a loyal follower to take out Geiz and Tsukuyomi; Tsukasa sends Sougo to meet his future self.

Sougo returns from the future and destroys his belt, ensuring that he will not become Oma Zi-O, but he is later attacked with no one to turn to for help.

Sougo has a dream that he is in the year 2022 and meets a man who goes by Kamen Rider Shinobi. Later, he encounters an Another Rider with the same attacks and a second Woz appears.

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.

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?

Sougo works with Mondo to get answers from his dad and Geiz works with "White" Woz to stop Another Quiz.

Heure breaks a mirror and gives an Another Rider watch to a man inside; Sougo and Geiz have trouble defeating an enemy who keeps retreating even though he has nowhere to run.

Sougo battles with his self on the other side of the mirror; Geiz tries defeating Another Ryuga when things go horribly wrong.

Sougo falls asleep while studying and travels 100 years into the future to a world where humans and machines are at war; Tsukuyomi joins forces with White Woz.

Sougo dreams of Kikai going evil while Ora asks White Woz for help with Heure; Geiz asks Tsukuyomi if she really wants to align herself with White Woz.

A man with a connection to Sougo's past is taking the leftover energy from previous Another Riders.

Tsukuyomi travels back in time to investigate Hiryuu Kakogawa; White Woz tells Geiz that his watch won't activate until he's committed to killing Sougo.

After getting beat by Geiz, Black Woz goes to Ora and Heure for help; Schwartz recalls the first time he met Tsukuyomi.

Tsukuyomi learns about Sougo's past; Sougo and Geiz prepare for their showdown.

Kamen Rider DiEnd runs off with Sougo and Geiz's watches when Tsukuyomi gets word of Another Blade; Sougo forces Woz and Geiz to work together.

White Woz has Blade and Chalice fight to bring on the end of the world; Black Woz and Geiz settle their differences.

Sougo and crew watch a news report of the G3 unit getting attacked by Another Agito. When they arrive during another attack, Sougo learns that Another Agito is able to multiply and one freezes in front of Tsukuyomi.

The Timejacker steal the real Agito's power; Woz questions Schwartz about Tsukuyomi's newfound abilities.

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.

Kyousuke has been outed as not being Hibiki; Sougo has Todoroki take Woz as his pupil for the day.

Sougo recalls his first love from elementary school; Ora recruits a woman falsely accused of murder to become Another Kiva; a new Kamen Rider falls from the sky.

Schwartz calls a temporary truce with the Kamen Riders to stop Ginga; Sougo tries to get Yuuko to stop her revenge.

Sougo and the others watch a news reporter turn into a monster; Tsukuyomi remembers a piece of her childhood; a meteor is heading for Earth.

The Hell Brothers steal the Fourze and Ginga watches so that Sougo and Woz cannot stop the asteroid; Tsukasa takes Tsukuyomi to visit her childhood home.

The DenLiner breaks down and the Imagin go to Junichirou to fix it; Yuuto Sakurai and Deneb emerge to stop Sougo from obtaining an unstoppable power.

Momotaros is warned about the demon king by Yuuto, taking back the Den-O watch in the process; the gang must travel back to 2011 to stop the Mole Imagin.

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.

Tsukuyomi saves Sougo from an attacking Geiz; Schwartz recruits Daiki Kaitou after he's caught stealing from Another Zi-O.

Schwartz reveals to Tsukuyomi that they are siblings; Ora and Heure are relieved of their Timejacker duties.

Kamen Rider Aqua arrives in a prototype Time Mazine to take Geiz and Tsukuyomi back to the future; Heure and Ora seek shelter with Sougo after being attacked by Another Drive.

Geiz doesn't trust Heure after finding out that Ora is Another Drive; Schwartz uses his powers to summon Kamen Rider Eternal.

Sougo and crew attempt to make a deal with the newly revived White Woz to save Geiz.

Sougo is given an ultimatum regarding his path by Schwartz and takes Tsukuyomi to visit her own time; enemies that should be defeated because of the previous Kamen Riders are now all returning.

Tsukasa has a plan to stop Schwartz, but it doesn't involve Sougo surviving the outcome.

Tsukuyomi has transformed into a Kamen Rider and the final battle has begun.