When a powerful Makamou appears that is resistant to the Slaying Sounds of Ibuki, Todoroki, and Hibiki, the Oni struggle to find a measure to combat it while Ibuki also battles with Akira�s whereabouts since she departed with Shuki. Meanwhile, Asumu finds himself worrying about his self-worth after he is cut from the band as Kiriya grates on his nerves.

After Hibiki is defeated by the fearsome Yobuko, Ibuki searches for Akira, while Todoroki is severely depressed over his perceived failure with Zanki. Meanwhile, Kyousuke stumbles upon Takeshi�s armory and attempts to transform into an Oni, while Asumu and Midori attempt to escape the clutches of the Makamou before they are devoured!

Seven years ago, a meteor slammed into the city of Shibuya and destroyed it, carrying with it the Worms, alien lifeforms that blend into the human population by copying people’s forms. The paramilitary corporation ZECT fights the Worms, developing the Masked Rider System as their anti-Worm weapon. When the paths of ZECT member Kagami Arata and the mysterious Tendou Souji cross, the day Souji has waited for finally arrives, as he is the man who walks the path of heaven…

Arata struggles with the Kabuto Zecter having chosen Souji over himself, especially in the face of Kabuto’s defeat against the Worms’ Clock Up ability. After enjoying a meal at a small French cafe, Souji and Arata rush into another battle with the Worms where Souji reveals that he knows more about the Masked Rider System than he first let on, gripping the Kabuto Zecter…

A woman named Yuki is attacked by the Lanpyris Worm and impersonated, but she survives, leaving two Yukis running around, but one is swiftly captured and imprisoned. Tensions increase between Souji & Arata, who is quickly falling out of favor with ZECT, as Souji sets the stage for the two Yukis to meet face to face again, kicking off a fight at an amusement park...

Arata must face the difficult truth about who his younger brother really is. Souji confronts Arata, telling him that he will defeat the Worms, no matter who they are. In the end, Arata is left with the toughest choice of his life, as the rain begins to pour…

Ending up at Souji and Juka’s home, Hiyori and Juka bond over their shared history of being present for the Shibuya meteor strike. Later, Souji offers to join Hiyori at the Tokyo Tower, but when ZECT sets their sights on Kabuto, will he be forced to break his promise?

Having been taken in by ZECT, Souji makes several demands, including speaking to Juka and asking Hiyori to make her breakfast. Arata begins to worry about Souji, but when he arrives at ZECT, Souji has already begun his escape. In the process, he learns that two of the ZECT members are Worms, and Arata tries to warn Misaki, but it may be too late...

Arriving from ZECT HQ, Kamen Rider TheBee joins the fight as Arata warns Souji to stay out of ZECT’s affairs now that they have a Rider following their orders. However, he ends up butting heads with TheBee’s user, Yaguruma Sou, ending up in a battle of tofu dishes with Hiyori as the judge. But will their clash in the kitchen spill over to the battlefield?

Souji turns out to have been correct about the other Worm escaping, so Shadow, now with Arata as part of the team, sets up at another wedding, locking it down. However, Souji manages to breach their defenses and takes on the Worm, but an angry Yaguruma won’t let this go and the two Riders face off…

As Kabuto and TheBee fight, Arata tries to stop them, giving TheBee an opportunity to gain the upper hand and destroy Kabuto’s belt. As Souji recovers from the battle, Arata struggles with his position as Hiyori once again remembers a memory of her past…

To defend the team from the Worms after Yaguruma loses his transformation, Arata obtains TheBee Zecter and transforms, finding himself as the new captain of Shadow. But can he fulfill the orders given to him from HQ?

Kageyama joins Misaki's team after the Shadow team has been dissolved; someone within ZECT is leaking information and former Shadow team members are getting killed.

Kagami is implicated of being the traitor; Hiyori accuses Tendou of killing her parents.

ZECT is working on a new Rider system; Kagami stumbles upon a Worm nest with a young boy trapped inside; Tsurugi is enticed by Tendou's cooking.

Kagami is hospitalized after trying to use Gatack; Tsurugi has his birthday party at Bistro La Salle.

Kagami sees Hiyori with a green rock that is attracting Worms; Tendou finds Tsurugi's butler running a sobo cart and decides to run it for him.

Tsurugi opens a restaurant across the street from Tendou's sobo stand; Hiyori wants to go into Shibuya with the hope that she'll uncloud her memories.

Tendou decides to try and get information through the police rather than ZECT; a Worm takes on Misaki's form and goes after Juka.

Misaki and Kagami's plan to get inside ZECT headquarters has failed; Misaki's Worm doppelganger has found her way to Tsurugi.

Kagami investigates after discovering that Tsurugi is a Worm; Hiyori finds a photo of her parents at Tendou's house.

After Hiyori finds out that she's a Worm, Tendou tells her about the murder of his parents.

After having lost Hiyori, Tendou joins ZECT and plans to take the Zecters from every Rider.

Tendou learns of the Hyper Zecter; Renge is enticed to try real food again; Tsurugi wants to know what it's like to live like a commoner.

Tsurugi explains to Kagami that he doesn't need the powers of Sasword anymore; Kageyama is determined to become The Bee again.

Kagami learns that Worms have been here long before the meteorite; Tendou is warned that Kabuto and Gatack have minds of their own.

The baseball team from Juka's school disappears right before her trip which causes Tendou to investigate.

Juka leaves for her trip as Tendou unravels the mystery of the mirror.

ZECT develops an Anti Mimic Bomb to counter the Worms; Kagami learns that his father is the head of ZECT.

A group of Natives have been kidnapped and Kagami is chosen to lead the negotiations; Yaguruma challenges Tendou to another tofu battle.

Tendou finds out that his mimic self has crossed over to this world; Kagami is called in to fight a Worm and has his Rider Kick turned against him.

Tendou and Kagami wonder if Hiyori was telling the truth about not wanting to return; ZECT is having a hard time trying to keep an army of Worms out of Area Z.

The Natives have made a necklace that detects Worms and ZECT are giving them out to everyone in the city.

Tendou learns that the necklaces are actually turning people into Worms; Kagami joins with the Natives to strive to create a peaceful world.

Kagami learns of the truth and heads out to stop the world from being turned into Worms.

Ryotaro becomes the bodyguard of an adoring idol who suddenly finds herself under attack, both in a plot of jealousy and an Imagin.

After discovering the Imagin contract holder is Kasumi's father, Ryotaro tries to discover why as Kintaros keeps trying to manage resolving the crisis in his own stubborn ways!

Ryotaro is taken hostage by a wannabe criminal in a bathhouse as an aquatic Imagin starts running amuck.

As he remains hostage by the bathhouse owner, Ryotaro tries to figure out the mystery of his relations with his former boss while trying to prevent Ryutaros from dealing with him his own way.

Otoya is tasked with helping a young girl pass an audition, being promised a date with Yuri in exchange. In 2008, Wataru meets an archer named Mami, who takes him under her wing, while Nago angrily pursues a criminal that is also the Seastar Fangire…

Convincing his student that her slump is due to her not playing from the heart, Otoya gives her the confidence she needs to not only pass the audition but to realize where her heart truly lies. In 2008, Wataru loses his resolve to fight, but when he discovers that Mami has been injured by the Fangire, her pep talk about doing what his heart tells him inspires him to remember why he battles the Fangire…

Arriving in the World of Blade, Tsukasa assumes the disguise of the Chief Waiter of the BOARD Corporation, an organization whose agents become Kamen Riders to battle the Undead. When the Elephant Undead goes on the attack, Sakuya Hishigata battles the Undead as Kamen Rider Garren as Kazuma Kendate arrives and transforms into Kamen Rider Blade. When the Capricorn Undead joins the fray, Tsukasa joins the fight, dispatching the Elephant Undead using Ryuki's powers. Afterwards, Natsumi and Yusuke meet BOARD's president Hajime Shijo, who decides to promote Tsukasa to the rank of King while Kazuma Kendate is demoted from Ace to 7 and Mutsuki Kuroba is promoted from King to Ace, thereby becoming Kamen Rider Leangle.

Decade continues his fight with Chalice, with Garren losing his Garren Buckle in the process. The fight comes to a sudden halt when Kamen Rider Todoroki shows up. Back at BOARD, Hishigata is demoted to Rank 3 while Kazuma is fired from BOARD. After he understands Tsukasa's intent to help him, Kazuma stays on in the kitchen as he opens the Ace Lunch to all BOARD members. Meanwhile, Mutsuki and Hishigata search for Chalice to get back the Rider systems, and are subsequently ambushed by Chalice, who knocks them out after they find out his true identity. After hearing that the two have supposedly resigned from the company, Kazuma decides to find Hajime with Yusuke's help.

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 afterwards 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.

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.

Tsukasa finds himself wearing strange clothes with another strange card as he, Natsumi, and Yusuke find themselves attacked by the Strange Demon Robot Schwarian and his Chaps as Kamen Rider Black RX battles them, with both sides believing Tsukasa to be Joe the Haze. When the Seamoon Fangire and Scorpion Imagin suddenly appear, Tsukasa becomes Decade to help RX out against the monsters with Agito's power as Schwarian runs off. After Natsumi stops RX from attacking Decade, RX takes her words to heart and sees Tsukasa as an ally.

Following Apollo Geist into another A.R. World, Decade is attacked by Kamen Rider Black until Diend arrives and summons Femme to hold him off. The next day, after learning that he is in the World of Black and seeing that he is on his own in saving Natsumi, Decade ambushes Guy as Ryuki and fights him until he uses a little girl as his hostage. When Decade takes a hit from Diend to save the child, Black watches and has second thoughts about him as Apollo Geist escapes.

Arriving in a new A.R. World, finding himself in a baseball uniform, Tsukasa notices the people are acting strange while saluting each other before he, Natsumi and Yusuke are singled out as rebels against Dai-Shocker with Propheta Cruentis, Go-Jaraji-Da, and Camponotus Worm Maxilla appearing to exterminate them. Amazon arrives to their aid, fighting the monsters with Decade backing him up as the people back up the surviving monsters under a boy named Masahiko.

Evading Apollo Geist and Llumu Qhimil with Diend's attempt to get the GaGa Armlet, Tsukasa has his wounds tended to by Natsumi in Dai-Shocker's school before Yusuke and a weakened Amazon join them, revealing that Masahiko took the GiGi Armlet as Ritsuko arrives and calls in the Dai-Shocker Soldiers after them despite Tsukasa questioning her faith in Dai-Shocker. Later after finding the Hikari Photo Studios in ruins, Amazon ponders if he should join them.

When Natsumi realizes that this is the world from her nightmares, she becomes wary for Tsukasa's well-being. Finding him in a tuxedo and feeling that this is the final chapter to their journey, they witness Wataru and Kazuma leading their respective Rider/monster groups against each other. After Rising Ixa and Leangle are killed off in the fight, Tsukasa makes his way to Wataru as he grieves over Ixa's death. Meeting the Fangire Queen Yuki, they learn from Wataru that the Riders are fighting each other to maintain the existence of their worlds.

After fighting off the Riders, Super Apollo Geist takes Natsumi to be his new bride as he flees. Kazuma Kenzaki appears, saying that Tsukasa's existence is the real cause of the worlds blending before confronting him as Kamen Rider Blade in King Form in order to force him to leave the world at once with Asumu keeping Yusuke and Wataru from interfering as Decade is easily defeated.

Eiji's traveler friend becomes manipulated by Uva into becoming famous as he steals others attributes; while Gotou doubts Eiji's effectiveness as OOO.

Eiji teaches a lesson to Tsukuba and Gotou about going forth to gain what is desired; while Ankh tries to figure a way to manage the flying Ageha Yummy using Gamel.

Kougami invites Eiji and Ankh over to celebrate the 1000th episode of Kamen Rider and decides to make a movie to celebrate; Kazari is drawn to a Shocker grunt who joins the movie.

Even though he's injured, Date still wants to finish directing the movie; Sendou starts sabotaging the movie with his new friends.