A luckless boy named Ryotaro Nougami comes across a strange train pass and becomes possessed by a powerful demon as he finds himself unexpectedly becoming the a hero known as Den-O fighting strange creatures from another time!

Ryotaro discovers more about his duty as Den-O to protect the timestream as he tries to figure a way to appease Tetsuo before the Bat Imagin can ruin the past.

Momotaros decides to use Ryotaro's body without his permission, leading to him to become the bodyguard of a minor criminal in need of cash.

Angry with Momotaros for using his body for the sake of money, Ryotaro decides to handle helping Yamagoshi without summoning the Imagin for help!

A suave but lying Imagin suddenly takes over Ryotaro's body, angering Momotaros as he fights to assert his dominance within the Singularity Point!

With Urataros causing nothing but trouble, Ryotaro is forced to make a decision regarding whether to keep the lying Imagin around while he and Hana try to figure out the Imagin's contract holder.

Momotaros tries to prevent Urataros from causing too much chaos with Ryotaro, while Ryotaro sparks the jealousy of a boyfriend of a girl he is forced with, leading to a drastic confrontation.

Both Ryotaro and his sister Airi work to try and improve relations between the broken couple as Den-O tries to figure out the mystery behind the Imagin's attacks.

Ryotaro and Hana pursue two Imagin attacking martial artists, one to eliminate rivals while another only to prove its own strength against other opponents.

Ryotaro tries to discover the truth regarding the karate champion possessed by the Rhino Imagin, while Hana tries to make sense of the Bear Imagin and what he really desires.

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 suddenly becomes possessed by an evil spirit who kicks out all the other Imagin and deals with threats in its own destructive way!

Ryutaros continues to cause problems to the other Imagin in holding on to Ryotaro's body, forcing them to take action in order to get their partner back.

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.

Ryotaro and Hana decide to clamp down on the Imagin possessing him out of fear of Den-O's health; as Ryotaro encounters a former classmate nostalgic for the past.

After encountering the mysterious Past Man, Ryotaro decides to stay in the past in hopes of determining who he really is, even at the risk to himself.

Yuto Sakurai's past self appears before Ryotaro to tell him to not try to be so reckless in his pursuits again as a violent Imagin suddenly makes its move in the present.

Yuto confronts Ryotaro about his duty as Den-O while both try to stop the Jelly Imagin from causing chaos.

Ryutaros grows jealous of Yuto due to his connection to Airi, making him take drastic action in order to take him down!

The fight between Den-O and Zeronos continues as they fire shot for shot, until Hana, once, again, tries to intervene.

A bizarre Imagin boards the DenLiner, pushing around the other Imagin in order to be pampered and to protect his newborn host!

After Ryotaro becomes arrested while trying to return Sieg's host, Hana tries to teach the troublesome Imagin what it means to be a real, responsible prince.

Ryotaro continues to try and gain the trust of Yuto, even as he's being dragged to an important climax!

Ryotaro continues to attempt to assist the Zeronos of the present in protecting a contract holder from the Spider Imagin even as Yuto's future self keeps dragging him to another time!

Two Imagin controlled by a hidden mastermind possess a pair of criminals in order to attempt to both attack the present and lure Ryotaro into a trap!

After defeating Gaoh, Ryotaro's ability to fight as Den-O becomes complicated when three of the Imagin start to fade away due to the measures needed in the prior showdown!

In order to gain the ability to use Climax Form better, Ryotaro uses a haunted house challenge to inspire the Imagin to work together in harmony.

Deneb approaches Ryotaro in hopes of having him become his Imagin in order to prevent Yuto from using his final Zeronos Card.

A former suitor of Airi returns in hopes of winning her heart in the absence of the missing Yuto, leading to Yuto's younger self and even Ryutaros to respond.

As Den-O has trouble dealing with the Anthopper Imagin, Yuto contemplates the need for the final Zeronos card and the permanent damage that will occur if finally used.

The DenLiner crew discover an anomaly associated with the missing future as Hana suddenly transforms into a young girl.

Ryotaro works to try and figure out the mystery of the wandering piano player and what his true wish is before his Imagin can complete its desire.

Fearful of Yuto's fate knowing of the truth of what happens to those who aren't remembered, Ryotaro decides to try to become strong enough to protect him and time.

As Ryotaro's dread on Yuto's fate is furthered with him becoming Zeronos again, he and the Imagin try to figure a way for him to transform in the past due to the mysterious future line throwing off their synchronization.

Ryutaros finds himself conflicted when his boss arrives to check on his progress, while he continues to feel the anger of trying to win Airi from Yuto.

With the DenLiner running amuck throughout time, the DenLiner crew must figure a way to save the trains while dealing with Ryutaros' feelings after being manipulated by Kai.

While Ryotaro tries to figure out the true purpose of Yuto's interactions with both present and past actions, Kai decides to experiment in eliminating Zeronos in the past.

With the people of the world altered from Yuto's removal from time, Ryotaro tries to figure out how to bring him back while dealing with Kai's manipulations.

Shocked by his actions in the world without Yuto, Deneb tries his hardest to create connections so that his partner will not disappear with the usage of his Zeronos cards.

Discovering that the female contract holder's wish was for Yuto himself, Deneb continues to try and make things memorable in hopes of helping his partner make true lasting memories.

With the realization that the defeat of Kai may mean the departure of the Imagin, Ryotaro begins to try and prove that he can fight on his own without any assistance.

With Ryotaro continuing to deny the help of the Imagin out of fear of losing them, Momotaros decides to take a stand while the others deal with the stowaway Imagin in the King Terminal.

Ryotaro tries to find a way to travel back to the day his sister lost her memory, in hopes that it would reveal the full truth regarding what happened to her and to her fiance Sakurai.

With the shocking revelation of what really happened the day Sakurai disappeared with Airi's memory, Ryotaro must piece together how it connects to his broken memory as the truth regarding the key to the Junction Point is revealed.

When Kai begins a multi-tier attack in order to eliminate Airi, both Ryotaro and Yuuto try to stop him, with a Imagin deciding to help in trying to make sure that the past and future is protected...

On their way back to stop Kai from killing Airi, Urataros takes over the DenLiner with several other Imagin, dumping Ryotaro at the moment where his missing memory is revealed!

Ryotaro returns to the present to confront Kai and bring an end to his mad reign of terror, even if it means an end to all Imagin, including Momotaros and his allies!

After Natsumi Hikari has a nightmare of every Kamen Rider being defeated by a figure called Decade, she helps her grandfather Eijiro deal with unsatisfied customers. The photographer, Tsukasa Kadoya, seems to be at fault, but he simply tells Natsumi the photos are bad because he does not belong in this world. After the argument, various holes in reality open, allowing the Orphnoch, Undead, Makamou, Worms, Imagin, and Fangires to start terrorizing their world. In the bedlam, she finds a corroded belt and book, recalling it as Decade's from her dream. She gives Tsukasa the belt and book, allowing him to transform into Kamen Rider Decade by using a card from the book and inserting it into the belt.

Arriving in the World of Kuuga, Tsukasa takes the guise of a policeman and watches Kuuga destroy a pair of Grongi, Ra-Dorudo-Gu and Me-Gyarido-Gi, before reverting to his human form, Yusuke Onodera. Tsukasa later destroys Go-Baberu-Da as Decade, but is mistaken for a Grongi by Yusuke and Ai. When Yusuke and Ai arrive at the Hikari Studio to discuss this strange Grongi, Tsukasa offers Ai his help in solving the mystery behind the Grongi's female targets and the location of their lair. On the foot of Mount Hitoki, the Grongi's Lair, Tsukasa reveals he used Ai as bait to lure out the remaining Grongi, revealing their plan to revive their leader before ruining their game. While attempting to destroy the Grongi, Decade is attacked by Kuuga, who reveals he knows about Decade's mission and will stop him at all costs.

After fending off the Hoppers who disappeared into another dimensional rift, Yusuke reveals he was told of Decade by a mysterious man. When Ai and her task force go to investigate Mount Hitoki, a black mist begins to rise from within, signaling the revival of N-Gamio-Zeda. Resurrected by the dimensional chaos, he uses his miasma to convert humans into Grongi. While Yusuke saves Ai and takes her to the hospital, Tsukasa fights the Grongi alone. A dying Ai requests Yusuke to overcome his angst and fight to protect everyone's smiles, and so Kuuga and Decade work together to destroy the remaining Grongi. N-Gamio-Zeda, in a last effort, absorbs all the Grongi to power himself up, but he is ultimately overpowered by both Decade and Kuuga, who destroy him with a combo attack.

Arriving in the World of Kiva, Tsukasa and company discover that the Fangires of this world have made a truce with the humans. However, when Tsukasa finds the Lion Fangire attacking a young woman, he transforms into Decade to fight him. Wataru, the King of the Fangire Race, witnesses this and becomes Kamen Rider Kiva to fight him with the aid of his Arms Monsters, forcing Decade to assume Kamen Rider Kuuga's Mighty, Titan, and Dragon Forms to counter. Yusuke manages to stop the fight, and the Swallowtail Fangire reveals that the young woman was actually a renegade Fangire. Yusuke reveals he has promised to help Wataru because he is uncomfortable with being the King.

As Tsukasa is fighting against Kaixa in another dimension, the Beetle Fangire defeats Wataru and becomes the new Fangire king, claiming Kivat. After the new King dissolves the truce, Yusuke arrives to protect Wataru before the boy runs off. After Yusuke expresses his reasons for helping the dethroned boy, Wataru takes refuge in the Hikari Studio. After being caught up on current events, Tsukasa makes his way to Castle Doran to save Yusuke as the Beetle Fangire absorbs the Arms Monsters into himself. After destroying the Swallowtail Fangire, Decade encounters the Beetle Fangire, who assumes Kiva's DoGaBaKi Form. When their fight makes its way to Yusuke and Wataru, the boy finds his courage to overcome his Fangire impulses and declares himself the King once more.

Upon arriving in the World of Ryuki, Natsumi goes to the Atashi Journal headquarters to learn about the world's Kamen Riders from its editor, Reiko Momoi. After Natsumi's arrival at the journal's offices, Reiko is mysteriously murdered, leaving Natsumi as the culprit as she had a small fork in her hand. Natsumi is arrested under suspicion of murder, and is to be sentenced with a Kamen Rider Trial: a system where Kamen Riders fight in the Mirror World to determine the outcome of criminal cases. Natsumi calls upon Tsukasa to be her lawyer, who meets with Shinji Tatsumi to hear what he knows of what happened to Reiko. As Shinji reveals that he is Kamen Rider Ryuki and he believes Natsumi was framed, his former friend Kamen Rider Knight is fighting in the Kamen Rider Trial, defeating several opponents. Shinji suggests to Tsukasa that he should fight as Decade in the Kamen Rider Trial to clear Natsumi's name.

After defeating Knight, Decade is about to finish him off when Ryuki pleads with him not to deliver the final blow, as he feels Knight must answer for his crime by his hand. However, Abyss uses this time to make his move to take out all three Riders at once, forcing them to retreat with Ren refusing to answer Shinji as he leaves. After her brief encounter with Narutaki, Natsumi learns that Shinji and Tsukasa are convinced that Ren is Reiko's murderer, although Yusuke sees otherwise. Meanwhile, a wounded Ren battles Kamen Rider Odin and defeats him, emerging from Mirror World with Odin's Time Vent as Shinji and Yusuke find him. Learning that Ren obtained the card to save Reiko, Shinji uses the card to go back in time as Tsukasa holds Abyss off. Arriving seconds before Reiko's death, Shinji and Tsukasa manage to save Reiko with the latter cornering her true murderer, Kamata.

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.

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.

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.

Upon arriving in the World of Agito, Yusuke is shocked that there are Grongi in the world which are being dealt with by Kamen Rider G3-X. He is further shocked when he sees an interview with Toko Yashiro, who is physically identical to the Ai Yashiro that died back in the World of Kuuga. Arriving at the police station, Yusuke offers to be the new user of the G3-X suit, but loses the position to Kaito. While this occurs, finding himself in a mailman outfit with a letter to Shouichi Ashikawa, Tsukasa and Natsumi find the man before they are attacked by what they think to be a Grongi. But during the fight, Tsukasa realizes he is fighting an Unknown, an Ant Lord called Formica Pedes.

After Yusuke saves Tsukasa from Delta's attack, Gills is about to fight when he's overcome with pain as the Unknown shows up to kill him. As Shouichi escapes, Toko recognizes him via G3-X's camera. While Tsukasa insists on protecting an annoyed Shouichi, Yusuke reports the defeat of the Grongi and the emergence of the Unknown. He finds Toko saddened, but has little time to help her as Kaito takes the G4 chip stored within his locker. Yusuke demands the chip back, but during the struggle, Toko blasts the chip to bits and a disappointed Kaito leaves. The next day, as Tsukasa continues to keep Shouichi safe from the Unknowns' attack, Yusuke learns that Shoichi was the original user of the G3 suit when he receives the letter for Shouichi from Toko.

When the Hikari Studio appears in the World of Den-O, Tsukasa finds himself dressed in a strange detective-like attire with possession of a Rider Pass. He is then suddenly possessed by an Imagin, who battles a Mole Imagin as Kamen Rider Den-O. After taking out the Imagin, the possessed Tsukasa walks off until Natsumi uses her pressure point move to drive the Imagin out of him. When the Imagin known as Momotaros tries to possess Tsukasa, again, he throws Yusuke in front of him and Yusuke becomes possessed. After easily overcoming M-Yusuke and treating him to pudding for answers, Tsukasa learns that the Imagin lost his physical form some time before they arrived.

After getting on the DenLiner, Tsukasa takes pictures of the DenLiner's gang before the Taros. But after Kohana sets the three Imagin in their place, they suddenty find the Hikari Studio as the front car. Kohana explains to Natsumi about the Imagin's new attack pattern as well as Momotaros, who Tsukasa decides to find. After surviving his confrontation with Diend and taking out another Mole Imagin, M-Yusuke tends to his injuries as Tsukasa finds him and scolds him for being an idiot. M-Yusuke senses the Imagin boss, and he and Tsukasa chase after the Alligator Imagin until he reveals himself. Using the Mole Imagin to cover his escape into the past, the Alligator Imagin battles Den-O and Decade, using the former's own DenGasher against him.

After helping the DenLiner gang in the past, Tsukasa and company begin their venture in the World of Kabuto. Posing as a ZECT Trooper, Tsukasa is deployed to aid Bright Troopers in the containment of a Worm as Kamen Riders Gatack and TheBee manage to exterminate it with the unseen aid of Kabuto. Soon after, Tsukasa brings Arata to the Studio to explain about his world, only to find a Worm had mimicked Tsukasa's form. After Natsumi uses the pressure point to expose one of the Tsukasas as a Worm, Decade fights it before it attacks a girl and is destroyed by Kabuto. Deciding to investigate the girl Mayu, they host a photo shoot for her, and Natsumi learns of Mayu's older brother who was supposedly killed by Kabuto. At ZECT's headquarters, TheBee's user, Sou Otogiri, tells Arata that the final prepation for the plans to capture Kabuto are nearly done.

Believing that TheBee's user is her brother, Mayu attempts to look for him with Natsumi's aid until they are attacked by a Worm. Counting on Kabuto to save them, Diend fights him to acquire his Clock Up system, summoning Ixa and Psyga to hold him down before Kabuto defeats them and runs off. By the time Tsukasa finds Natsumi and Mayu, the latter is shocked that she became a Worm as she runs off. She runs into Sou who reveals himself as the Phylloxera Worm and brings her to ZECT HQ as part of the Kabuto Capture plan, much to Arata's dismay before he is beaten to a bloody pulp questioning the plan. After escaping, Arata makes his way to Tsukasa and reveals the plan to him, confirming Tsukasa's notion. Kabuto falls for the trap as the Clock Down takes effect while the Worms reveal themselves among the ZECTroopers, with Sou exposing Kabuto as Mayu's real brother Souji.

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.

With their tour of the nine Kamen Rider Worlds complete, the Hikari Studio group returns to their home world, finding it as it was before the monsters appeared. Tsukasa is the only one who feels something is not right and questions the reason for the journey. Before Yusuke or Natsumi can attempt to answer, they encounter the violinist Otoya Kurenai, who thanks them for saving the world and tells Tsukasa that he earned a world of his own for his journey. As Natsumi goes out to see her TG Club friends and teacher for a high school reunion, Tsukasa and Yusuke have a short encounter with Narutaki who congratulates him on getting his own world.

After Tsukasa suddenly loses his powers, he learns from Kaito that he is actually in the World of Negatives. He later is seen by a talent agent and is offered to be signed onto his agency to become an idol. Although Yusuke acts as the voice of reason, he gets caught up in the fame seeking as well. Meanwhile, after her school friends return while waiting for Chinatsu, Natsumi that suggests that they should dig up the "treasure" they buried together, only to find that a parking lot was built over it and learning that Chinatsu moved their treasure prior. Once, Tsukasa finds Natsumi, he attempts to tell her that they are not in the real world, but Natsumi refuses to accept this as she runs off to the TG Club's hideout where she also meets the World of Negatives's Natsumi.

Arriving in Kaito's homeworld, the World of Diend, Tsukasa finds the world in peace and harmony, but with Kaito a wanted man. As Tsukasa assumes the role of a traveling salesman, he meets Kamen Riders Larc & Lance as they battle a Darkroach. After destroying the monster, Tsukasa learns that the world's residents kill Kamen Riders. As Tsukasa and company meet the head of area management committee, Junichi Kaito, Larc and Lance battle the Darkroaches until they receive aid from Diend. Saving them from reinforcements, Tsukasa learns from Haruka and Shin that the world is ruled by the mysterious Fourteen who uses his Roaches to manipulate humans.

Nearly killed by Lance, Kaito is spared when Larc stops her partner as he reminds her that he is the reason that Junichi is under Fourteen's control. After escaping the angry mob, parting from Haruka and Shin, Kaito and Tsukasa find Natsumi who tells them that Yusuke has been kidnapped by the Roaches before Junichi arrives. After remembering the events leading to his brother's enslavement, Kaito is reluctant to fight as he and Tsukasa transform to follow Junichi, leaving the brain-washed Yusuke behind and taking Natsumi to undergo the process as well.

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.

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.

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.

시계방 ‘구시오시’를 경영하는 작은할아버지와 함께 사는 고3, 지호. 진지하게 왕이 될 생각인 지호에게 어느 날 갑자기 웬 청년이 찾아와 붉은로봇을 조심하라고 한다. 말이 끝나기가 무섭게 그 말은 현실이 되고, 붉은로봇을 피해 도망치던 지호는 검은로봇의 도움으로 일단 위기는 넘긴다. 하지만 그 검은로봇의 주인인 셀레네한테서 2068년 자신이 최악의 마왕이 되어 세상을 파괴한다는 말을 듣게 되는데…

지호의 목숨을 빼앗겠다며 달려드는 게이츠. 게이츠와 마찬가지로 미래에서 온 셀레네는 위기에 처한 지호를 또 다시 구해준다. 한편, 거리에는 어나더빌드라는 괴인이 나타나고, 쓰러뜨려도 다시 되살아나는 어나더빌드를 쓰러뜨리기 위해 워즈의 말에서 힌트를 얻은 지호는 꿈에서 만난 줄로만 알았던 래오와 용주를 만나러 nasita로 향하는데…

미래에서 온 게이츠, 셀레네와 한 지붕 아래에서 살게 된 지호. 그들은 지호의 학교까지 쫓아온다. 학교에서는 ‘아무도 클리어할 수 없는 게임’이 유행하고 있었고 게임의 공략을 찾던 중 ‘천재게이머 M’에 대한 소문을 듣게 되는데…

가면라이더 이그제이드로 변신한 천재게이머 M, 도명호. 하지만 쓰러뜨렸던 어나더라이더가 되살아나면서 명호는 이그제이드였던 기억을 잃게 된다. 지호는 명호에게 도움을 요청하지만, 명호는 자신은 해야할 일이 있다며 지호의 요청을 거절하는데…

여학생 연쇄실종사건이 어나더라이더와 관련이 있을 거라 생각한 지오와 게이츠, 셀레네는 다음 타깃이 될 수 있을 만한 여학생을 찾아 천강고등학교를 찾고, 때마침 어나더라이더를 발견하지만 결국 놓치고 만다. 그래서 지호와 게이츠는 최초의 희생자가 발생했던 2011년으로 가서 어나더라이더를 쓰러뜨리려 하는데…

하나의 어나더라이더 몸에 두 라이더가 공존하는 기묘한 모습을 본 지호와 게이츠. 게이츠와 셀레네는 2011년 이전에도 여학생 실종사건이 있을 것으로 추측하고 새롭게 조사를 시작한다. 그러다 어나더라이더에게 쫓기고 있던 최하린한테서 이상한 점을 발견하는데…

마술쇼가 열리는 공연장을 찾은 지호와 게이츠, 셀레네. 하지만 거기서 본 것은 마술이라기보다 마법에 가까운 것이었다. 과거, 마법을 쓰던 가면라이더, 위저드가 있었음을 생각해 낸 게이츠는 타임재커가 관여했음을 직감하고 마법을 쓴 마술사, 조현우를 공격해 언제부터 힘을 얻은 것인지 알아내려 하는데…

조현우가 변신한 어나더위저드의 공격에 셀레네가 혼수상태에 빠진다. 처음부터 조현우를 경계했던 게이츠는 지호의 안일한 태도 때문에 벌어진 일이라며 혼자서 셀레네를 구하려고 한다. 한편, 지호는 워즈의 지혜를 빌려 사태를 헤쳐나가려 하는데…

대기업, 현파운데이션이 국가로서 독립하겠다고 선포한다. 왕이 되겠다는 현도현을 본 지호는 자신도 장차 왕이 되려는 사람으로서 흥미를 가진다. 게다가 현도현은 어나더오즈로까지 변신하는데…. 한편, 게이츠는 겜마워치를 얻고 2016년으로 가서 어나더오즈를 쓰러뜨리지만 어나더오즈는 다시 살아난다.

도현에게 붙잡힌 국회의원 준혁은 나래와 힘을 합쳐 탈출을 시도하지만 지호에게 붙잡히고 만다. 하지만 지호에겐 도현 밑으로 들어간 진짜 의도가 있었는데…한편, 지호가 마왕이 될 거라 확신한 게이츠는 구시오시에서 짐을 싸서 나온다.

인기 댄스팀의 멤버들이 연이어 행방불명되는 사건이 발생한다. 그런데 지호는 그것이 어나더라이더에 의한 것으로 추측하고, 그 외에도 절대 알 수 없는 사실들을 이미 알고 있는데…

게이츠를 구하기 위해 3일 후 미래에서 온 지호. 미래에서 온 지호는 현재의 자신과 셀레네에게 어나더가이무에 대한 것과 라이드워치를 손에 넣을 수 있는 힌트를 전해준다. 한편, 자신의 만류에도 불구하고 게이츠를 구하려는 지호를 보며 워즈는 타임재커에게로 향하는데…

게이츠는 약해졌던 마음을 다잡고 언제든 지호를 쓰러뜨리기 위해 구시오시로 돌아온다. 한편, 거리에서 사람들을 공격하던 어나더라이더가 있었다. 불가사의현상 연구소의 유영과 이탁은 그 어나더라이더를 잡으려 하지만, 그곳에 가면라이더 아기토가 나타나 방해를 하는데…

유령이 된 지호. 그런 지호의 모습은 셀레네나 게이츠에겐 보이지 않았다. 게이츠는 지호를 원래대로 돌려놓기 위해 2015년으로 향한다. 2015년에서 어나더고스트를 쓰러뜨리려던 게이츠였지만 가면라이더 디케이드가 나타나 그의 앞을 가로막는데…

어렸을 때부터 반복해 꾸는 꿈에 대해 게이츠와 셀레네에게 말하는 지호. 그 꿈은 지호가 왕이 되려는 이유와도 관계가 있었다. 그런데 그 꿈이 현실이 된다. 하늘을 뒤덮은 거대한 로봇들. 미래에서 온 오마지오의 심복, 카신. 한편, 디케이드의 개입에 의해 지호는 미래로 날아가게 되는데…

미래에서 오마지오가 된 자신을 만나고 온 지호는 벨트를 버려야 할지 말아야 할지 크게 고민한다. 그리고 게이츠에게 자신의 벨트를 부숴달라고 부탁한다. 벨트가 사라지자 오마지오가 존재했던 역사는 사라지고, 게이츠와 셀레네는 자신들이 있던 시대로 돌아갈 준비를 한다. 한편, 타임재커는 오마지오가 다시 생겨날 가능성을 남기지 않기 위해 지호를 없애려 하는데…

다시 지오가 되어 싸우기로 결심한 지호, 그 결심이 전환점이 되어 시간의 흐름은 미지의 국면으로 접어든다. 그 때문에 본래 역사에는 존재하지 않았던 ‘가면라이더 닌자’가 생겨나고, 그로부터 ‘어나더닌자’가 태어난다. 게다가 워즈와 똑 닮은 또 다른 ‘워즈’까지 나타나는데…

또 다른 미래에서 왔다는 또 한 명의 워즈는 가면라이더로 변신한다. 한편, 어나더닌자를 쓰러뜨리기 위해선 닌자워치가 필요하지만 가면라이더 닌자는 ‘다른 미래’에 존재하기 때문에 만날 수가 없었다. 그래서 지호는 영수가 가면라이더 닌자였다는 점에 주목하는데…

또 다른 미지의 어나더라이더, 어나더퀴즈가 나타난다. 블랙워즈는 지호에게, 화이트워즈는 게이츠에게, 그 어나더라이더의 힘을 빼앗도록 해 각자가 바라는 미래로 만들려 한다. 그리고 같은 시대에 공존할 수 없는 가면라이더 퀴즈까지 나타나는데…

2040년에서 온 가면라이더 퀴즈, 안서문. 가면라이더 퀴즈의 힘을 빼앗아 게이츠를 구세주로 만들려 하는 화이트워즈의 계략으로 지오와 게이츠는 싸우기 시작한다. 한편, 아버지 영철을 쫓아 2019년으로 온 서문은 싸움 도중 아버지를 만난다. 그리고 아버지에게 문제를 하나 내는데…

어나더라이더가 사람들을 공격하는 사건이 발생한다. 지호와 게이츠는 둘이서 맞서 싸우지만 어나더라이더는 모든 공격을 튕겨내며 사라져버린다. 사건의 열쇠가 ‘ORE저널’에 있음을 알게 된 지호는 낚시터로 향한다. 그리고 그곳에서 ORE저널의 편집장을 만나는데…

어나더류우가와 전투도중 우연히 들어간 미러월드에서 자신을 만난 지호. 거울 속의 지호는 자신에게 말로만 깨끗한 척하는 위선자라며 매도한다. 자신의 정체성에 대해 고민하던 지호는 어두운 면을 가진 나도 나란 건 변함없다는 신지의 말에 어두운 자신을 받아들인다. 한편, 어나더류우가를 쓰러뜨리기 위해 게이츠는 자신의 목숨을 건 필살기를 쓰고 마는데…

졸업 못할 위기에 처한 지호, 재시험 공부 도중 잠이 든 지호는 기계와 인간이 대립하는 먼 미래의 꿈을 꾼다. 그런데 꿈에서 봤던 라이더의 어나더라이더가 현실에 나타나는데…

스와츠는 가면라이더 기계의 힘을 얻기 위해 우르를 어나더기계의 촉매제로 삼고, 화이트워즈는 게이츠리바이브가 탄생할 수 있도록 그 힘을 빼앗아 3개의 라이드워치를 완성시키려 한다. 한편, 2121년 미래에서는 폭주한 렌트를 막기 위해 지호가 아이들과 힘을 합치는데…

이미 쓰러뜨린 어나더라이더가 계속해서 나타나고 과거에 타임재커와 계약했던 사람들이 공격을 받는 일이 발생한다. 사건을 쫓던 지호와 워즈는 마침내 모든 어나더라이더의 힘을 지배하는 어둠의 왕, 어나더지오에 다다르는데…

모든 어나더라이더의 힘을 지배하는 어둠의 라이더, 그들의 왕인 어나더지오 강비류는 지오에게 적대감을 드러내며 그를 쓰러뜨리려 한다. 한편, 타임머신을 타고 2009년으로 간 셀레네는 그곳에서 어린 지호와 비류에게 일어난 버스사고를 확인한다. 그리고 게이츠는 마침내 게이츠리바이브로 진화하는데…

자신이 마음을 다잡지 못한 탓에 셀레네한테 미안한 짓을 했다고 생각한 게이츠는 가면라이더 게이츠리바이브로 변신하고 지오를 쓰러뜨리기로 결심한다. 한편, 지호와 게이츠가 부딪히는 걸 염려한 블랙워즈는 그것을 막고자 우르에게 접근, 화이트워즈에게서 워즈워치를 빼앗으려고 하는데…

화이트워즈한테서 가면라이더 워즈의 힘을 빼앗은 블랙워즈는 게이츠가 지호와 승부를 내지 못하도록 그의 앞을 막아 선다. 한편, 지호 역시 강비류 때문에 발이 묶이게 된다. 하지만 그럼에도 두 사람은 서로 한 약속을 지키기 위해 지친 몸을 이끌고 마지막 결투 장소로 향하는데…

지호와 게이츠의 결전은 지호가 그리던 결말을 맞았다. 그리고 새롭게 워즈를 식구로 맞으며 지호와 게이츠, 워즈와 셀레네는 한 지붕 아래에서 살게 된다. 그곳에 지오 세계의 보물, 라이드워치를 노리고 나타난 다이키. 그런 다이키 뒤엔 화이트워즈가 있었는데…

지오 앞에 나타난 가면라이더 카리스. 그리고 뒤이어 나타난 겐자키도 가면라이더 블레이드로 변신한다. 블레이드와 카리스의 운명적인 싸움의 막이 오른다. 그 뒤에서 가면라이더 워즈의 힘을 빼앗긴 화이트워즈가 조심스럽게 움직인다. 다시 한번 게이츠에게로 향하는 그의 손엔 지오2워치와 게이츠리바이브워치가 들려있는데…

지금까지 모은 라이드워치는 14개, 지호가 마왕의 힘을 손에 넣기 위해서 모아야 할 워치는 앞으로 6개. 경찰 특수부대 G3유닛이 어나더아기토의 공격을 받는 일이 발생, 지호는 G3유닛을 도와 어나더아기토와 싸운다. 하지만 어나더아기토가 계속해서 증식하자 지호는 가면라이더 아기토를 찾으려 한다. 그렇게 찾아낸 곳이 레스토랑 아기토였는데…

전투용 특수강화복 G3 테스트 중에 일어난 어나더아기토 습격사건. 어나더아기토를 상대하던 지호는 마침내 가면라이더 아기토, 강민과 만난다. 하지만 타임재커가 나타나 가면라이더 아기토의 힘으로 아기토 라이드워치를 만들어내고, 그것을 어나더아기토의 몸 속에 집어 넣는다. 강화된 어나더아기토를 상대로 고전하는 지호. 한편, 싸움 중 자신한테 숨겨진 힘이 있다는 걸 알고 셀레네는 혼자서 고민하는데…

4월 28일, 지호의 생일을 앞두고 성대한 축하의식을 준비하기 위해 고민에 빠져있는 워즈. 그러다 지호의 졸업앨범에서 장래에 ‘도깨비가 되고 싶다’는 지호의 동창을 발견한다. 그러던 그때 어나더라이더가 나타나는데…

마왕의 힘을 손에 넣기 위해 남은 5개의 라이드워치를 모으려 하는 지호. 그의 앞에 스스로를 가면라이더 히비키라고 칭하는 신우가 나타난다. 하지만 그는 히비키가 아니었고, 진상을 알기 위해 지호는 도도로키를 찾아간다. 한편, 지호의 생일을 축하하기 위해 고민하던 워즈는 도도로키의 제자로 들어가는데…

철없는 아이처럼 보였던 지호한테도 첫사랑의 추억이 있다는 말을 듣고 반신반의하는 게이츠와 셀레네. 그때 구시오시에 시계 수리를 맡기고 간 한 신사가 어나더라이더의 공격을 받는다. 자신을 여왕이라 칭하는 여성, 어나더키바의 어떤 행동에 지호는 첫사랑을 떠올리는데…

우주에서 온 가면라이더 은하! 만물을 없애는 그 힘에 타임재커조차도 위협을 느낀다. 그래서 어나더키바, 이윤주와 힘을 합쳐 은하에 대항할 작전을 세운다. 한편, 자신의 첫사랑 상대가 이윤주라고 확신하는 지호는 윤주가 복수하는 걸 저지하고자 어나더키바 앞을 막아 선다. 그리고 무죄라고 주장하는 윤주의 말이 걸렸던 게이츠는 살인사건이 있었던 2015년으로 날아가는데…

최든 들어 빈번하게 떨어지고 있는 운석엔 외계생명체 웜이 타고 있었다. 그들은 지구에 떨어져 인류에게 의태, 지구를 정복하려 하고 있었다. 지구가 위태로운 상황에서 때마침 나타난 건 가면라이더 가탁크였는데…

포제아머로 거대운석을 폭발시켜 지구를 구한 줄 알았으나, 그 뒤엔 더 거대한 운석이 숨어 있었다. 지오는 작전을 짜기 위해 다시 지구로 돌아온다. 지호는 워즈가 새롭게 손에 넣은 은하의 힘과, 포제의 힘을 써서 초거대운석을 부수려고 하지만 가게야마가 가가미를 납치해갔다는 사실을 알고 그를 구출하러 간다. 한편, 셀레네는 츠카사와 함께 자신이 어릴 적 살았던 집으로 간다. 그곳에서 셀레네는 충격적인 사실을 알게 되는데…

시간을 넘나드는 열차, 덴라이너가 불시착한다. 안에서 줄줄이 나타난 건 이매진들. 그들은 구시오시에 찾아와 준일에게 덴라이너의 수리를 의뢰한다. 그러던 때, 오라는 누나의 애인을 원망하고 있는 주하를 이용해 어나더덴오를 만들어 내는데…

덴오 워치를 손에 넣으며 라이더 20명의 힘이 모인 최강의 워치, 그랜드지오워치를 만든 지호. 하지만 지호를 세계를 멸망시킬 마왕이라며 경계하는 사쿠라이와 데네브의 개입으로 그랜드지오워치는 사라지고 만다. 구시오시로 돌아온 지호는 어나더덴오, 주하의 바람을 알게 되고, 과거로 가서 주하를 막으려 하는데…

그랜드지오 대 오마지오, 모든 라이더의 힘을 걸고 구사하는 격렬한 싸움. 하지만 지호의 힘은 오마지오의 힘에 미치지 못했다. 그 이유는 모든 워치를 모은 것이 아니라고 하는데. 시간의 흐름이 바뀌었다? 지호가 돌아온 건 2019년이었으나 모든 것이 바뀌어 있었다. 구시오시에선 준일이 자신을 못 알아보고, 셀레네와 게이츠도 지호를 적으로 보고 있었다. 그리고 동상의 중심엔 강비류가 있었는데…

기존에 존재하던 세계가 초기화되고 강비류가 새로운 세계의 왕이 되어 있었다. 게이츠는 세상을 구하기 위해, 그리고 싸우다 죽은 동료들을 위해 지오를 공격한다. 게이츠와 싸우고 싶지 않았던 지오는 변신을 해제한다. 한편, 다이키는 이 세계의 보물을 찾아 스와츠와 비류 앞에 나타나는데…

스와츠에게 납치된 셀레네는 자신이 왜 기억을 잃고 떠돌게 되었는지, 그 배경이 된 일족의 비밀에 대해 듣게 된다. 한편, 셀레네를 찾던 지호와 게이츠는 어나더 라이더들한테서 도망치고 있는 우르와 오라를 만나는데…

마라톤 경기 도중 선수가 감쪽같이 사라지는 일이 발생한다. 그는 지호의 고등학교 동창이었다. 게다가 셀레네도 보이지 않자 지호는 게이츠와 함께 셀레네를 찾아 나선다. 그러던 그들 앞에 타임머신이 나타나고, 그 안에서 나온 건 가면라이더 아쿠아, 민하루였다. 그는 셀레네와 게이츠를 데려가기 위해 미래에서 왔다고 하는데…

어나더드라이브의 정체는 오라였다. 혼란에 빠진 우르 앞에서 타임재커를 믿느냐 마느냐로 지호와 게이츠의 의견이 충돌한다. 게다가 게이츠는 자신이 이 세계에 머무는 것이 옳은 것인지 고민하고 있었다. 한편, 스와츠는 지호의 동창, 민우에게도 접근해 그를 어나더월드로 보내버린다. 그리고 소환한 다크라이더는 가면라이더 이터널이었는데…

게이츠가 어나더월드에 갇히자 화이트워즈가 나타난다. 놀란 것도 잠시, 지호는 게이츠를 구하기 위해 화이트워즈에게 도움을 요청한다. 한편, 스와츠는 잃어버린 가능성의 세계, ‘어나더월드’를 만들어 다크라이더를 부활시킨다. 그를 막기 위해 미래에서 온 민하루도 일찍이 오즈한테서 배운 용기의 힘을 내는데…

세계에 이변이 일어나기 시작했다. 거대한 벽이 나타나 나라를 나누고, 구시오시에 보관되어 있던 지오의 워치에도 이상이 생긴다. 스와츠의 진짜 목적을 눈치채기 시작한 지호는 츠카사의 도움으로 셀레네와 함께 그녀의 과거로 향한다. 한편, 거리엔 드라이브의 적, 로이뮤드가 나타나기 시작하는데…

츠카사, 디케이드는 이 세계를 파괴하겠다고 선언한다. 각 라이더의 세계가 하나로 합쳐지고 있었다. 빌드 세계의 스카이월, 더블 세계의 풍도타워가 나타나고, 적 몬스터가 거리에 넘쳐난다. 이 현상을 일으킨 중심에 자신이 있다는 것을 지호도 자각하고 있었다. 마지막 시간여행, 지호는 오마지오와 마지막 승부를 내기 위해 타임머신을 타고 2068년으로 향한다.

가면라이더 셀레네의 탄생. 하지만 그 힘은 생각지 못한 방향으로 쓰인다. 츠카사와 지호의 작전은 실패하고 마는 것인가? 다가오는 세상의 종말, 어수선한 광경과는 반대로 지호는 조용히 각오를 다진다. 그리고 마침내 이 이야기의 마지막 한 페이지가 시작된다,