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In the corporate-owned Zawame City, dance teams compete for street cred. When Team Gaim loses their turf to the rival Team Baron, Mai and former member Kouta are called by Team leader Yuuya to check out a new gadget that might help them win their turf back. Instead, they discover Yuya missing and a portal to another world...

Kouta's transformation into Armored Rider Gaim puts Team Baron on the defensive. Baron's leader Kaito Kumon decides to test his new rival's mettle in the Inves Game.

Team Gaim's win streak continues thanks to Kouta's new powers. But when Kaito becomes Armored Rider Baron, Kouta learns the playing field has been dangerously leveled.

Kouta's encounter with a white Armored Rider leaves him traumatized and Team Gaim defenseless. Mitchy puts himself on the line to save Team Gaim - and earn Mai's attention.

Mitchy becomes Armored Rider Ryugen, Team Gaim's newest protector. But when Armored Rider Baron proves too much for Ryugen, Kouta must overcome his fear and rejoin the battle.

The turf wars in Zawame City escalate when Armored Riders Gridon and Kurokage take the stage. Meanwhile, an eccentric ex-soldier takes notice of the growing conflict and decides to throw his beret into the ring.

The Armored Riders are helpless against the war-hardened Bravo. It's now up to Kouta & Mitchy to figure out how to stop Oren before the Beat Riders become history.

In her search for Yuya, Mai is trapped in the mysterious forest and finds an unlikely savior in Kaito. Now the two must work together to make it out - if the Inves don't get them first.

A flying Inves escapes through a portal and wreaks chaos across the city. Team Gaim hatches a plan to catch it, but quickly learn Yggdrasil knows far more about the Inves than they let on...

Learning that Yggdrasil is covering up the Inves infestation, Team Gaim plots a scheme to investigate the corporation's goals.

The Inves forest becomes a battleground between the Armored Riders as Kouta & Mitchy investigate Yggdrasil. What they learn teaches them this was never just a game.

Yggdrasil's eyes & ears are everywhere. Mitchy realizes the corporation has been using them as guinea pigs and asks Kouta something unthinkable: discard his Sengoku Driver.

A mysterious illness spreads across Zawame, and the Beat Riders are blamed for it. Kouta & crew try to figure out how to stop it, but the hero's world is forever changed when an even worse fate befalls a friend.

A fellow Beat Rider - now transformed into a mindless Inves - rampages across the city. Kouta knows what he has to do, but doesn't know if he can bring himself to do it. Mitsuzane learns a horrific truth that changes everything.

The battered Kouta & Kaito are captured by Yggdrasil, where they meet the developer of their Driver tech: Ryoma Sengoku. An unexpected ally comes to Kouta's aid, but can he be trusted?

After Kouta escapes Yggdrasil's clutches, he has put a stop to a Beat Rider team using Inves to commit crime. Takatora confronts Mitsuzane about his secret life and shows him what Yggdrasil is truly fighting against.

Takatora gives his newly-recruited brother Mitsuzane a heavy task: defeat Kouta and take his Driver. When Kouta learns his sister is kidnapped, he has to face the combined might of Bravo and a new Armored Rider.

Mai tries to organize a live dance event to salvage the Beat Riders' reputation. Armored Rider Bravo crashes the party, and it's up to Zack to save the day without Kaito at his side.

Kouta & Kaito try to break into Yggdrasil's labs when the suspicious DJ Sagara lends a hand. Gaim faces an old foe that defeated him before - and this time he isn't running away.

More and more Inves pour into Zawame City while Ryugen & Knuckle try to stop them. Meanwhile Kouta & Kaito both learn the horrific truth of the Helheim Forest and what it means for mankind.

Unless nothing is done, the Helheim Forest will consume Earth and mankind will go extinct. Mitsuzane pressures Kouta to keep this truth a secret. Kaito investigates a mysterious life form in the forest.

A dangerous crack appears in the city, and Kouta enters the Helheim to close it from the inside. The Armored Rider is forced to work alongside Ryoma & Yoko - before learning a truth that shatters him to his very core.

When Kouta learns the truth of Yuya's fate and loses his will to fight, Sagara bestows a power upon Kouta to defy the world itself. Kaito encounters one of the Helheim Forest's Over Lords and gets a taste of their mighty power.

Kaito pursues the Over Lords but is overwhelmed by their strength. Kouta also decides to investigate the Over Lords, but his recalcitrance begins to test Mitsuzane's loyalty.

When Jonouchi despairs at his directionless life, Oren puts his protege through a grueling training regimen. Yggdrasil confronts Sagara's subterfuge. Who - or what - is Sagara?

Mai forces Kouta to tell him the truth of everything - of the Helheim, and of Yuya. This enrages Mitsuzane, whose concern for Kouta warps into hatred. Kaito resolves to settle the score with the Over Lord Demushu.

In an act of jealous hatred, Ryugen knocks Gaim unconscious, only for Baron to intervene. Takatora reflects on the early days of Project Ark and his friendship with Ryoma. As Kouta tries to escape the forest, he's forced to cooperate with an old foe.

Takatora, inspired by Kouta, tasks his team with finding the Over Lords to negotiate with them. Ryoma instead concocts a plan with Yoko & Sid to remove Takatora from the picture entirely.

With their leader gone, Sid sabotages Yggdrasil and goes rogue. Kouta begrudgingly agrees to help his enemies track the Lockdealer down, but has to contend with "Zangetsu Shin", who is secretly Mitsuzane in disguise. Meanwhile, Takatora clings to life in the hands of the Forest's ruler.

Kouta & Mai rescue an amnesiac named Jiro from the rain, and discover that he's a superpowered android codenamed "Kikaider." Meanwhile, Ryoma comes into possession of schematics to build a similar (and more nefarious) android.

Sid learns of the fabled "Fruit of Knowledge", a cosmic power whose bearer can remake the world itself. The Lockdealer resolves to take it for himself from the Over Lord's leader Rosyuo. The violent Demushu escapes into Zawame City and unleashes a warpath.

Demushu gravely wounds Kouta as the Over Lord's onslaught across Zawame continues. Mitsuzane forms an insidious alliance with Redyue. To save the world, Sagara offers Kouta a Faustian bargain.

Ryoma betrays Yggdrasil, leaking Project Ark to the world. Meanwhile, as Zawame City is left to fend for itself against hordes of Inves, the Beat Riders fight to protect the civilians left behind.

Zawame City is isolated from the world as Redyue turns it into her playground. Inves begin rounding up humans as part of a scheme to resurrect Rosyuo's lost Queen. Meanwhile, Yoko catches on to Mitsuzane's duplicity.

The apocalypse begins as Rosyuo unleashes the full power of the Helheim upon Earth. Kouta, Kaito, & Yoko plan an assault on Yggdrasil Tower to stop the Over Lords. Mitsuzane finally shows his true colors to Kouta.

Just as Mitsuzane is about to kill the shocked Kouta, Takatora intervenes. Zangetsu must now face his mistakes by stopping the monster he helped his brother become.

Kaito awakens in an alternate reality where Armored Riders compete in super-powered soccer games.

Having finally erased his brother's shadow, Mitsuzane descends into madness. Professor Ryoma returns to Zawame City and offers the Riders a secret passage into Yggdrasil Tower - but what's his true goal?

The Riders team up with Ryoma to break into Yggdrasil Tower to free Akira & Mai. Meanwhile, Mai tries to convince Rosyuo that mankind is worth saving.

Kouta reaches Yggdrasil Tower as Kaito confronts Mitsuzane. Redyue infiltrates Kouta's mind, forcing him to grapple with his transformation into an Over Lord - and his destiny in a world that will see him as a monster.

Mai's kindness touches Rosyuo's weary heart, and he entrusts her with the Golden Fruit's safekeeping. Kaito & Kouta confront the Helheim's King to put an end to the invasion once-and-for-all.

Mai has fallen gravely ill, and the Golden Fruit inside her is the cause. In a desperate effort to save the only person left he cares about, Mitsuzane brandishes a dark power and crosses the point of no return.

Gaim and Ryugen Yomi continue their tragic battle. Meanwhile, Kaito confronts the sadistic Ryoma and is forced to relinquish his own humanity - and embrace a foreboding destiny.

Mai transcends her human form and embraces her cosmic role as Woman of the Beginning. Kaito - now an Over Lord - sets out to eliminate his old friends and take the Fruit of Knowledge for himself.

The lines are drawn and the final battle begins. On one side, Kouta, who holds onto hope for mankind. On the other, Kaito, who would erase this world and create one without oppression. Who will pluck the forbidden fruit?

The showdown between Lord Baron and Armored Rider Gaim reaches its climactic conclusion. In its wake, old friends must reconcile with a changing world.

It's been seven months since the Helheim's invasion ended. Mitsuzane must now pick up the pieces and redeem himself for his sins. When an old enemy returns, it's up to Armored Rider Ryugen alone to save the city.