The new school year begins at Amanogawa High School, and Utahoshi Kengo is detecting strange energies around the school. And things get stranger when Kisaragi Gentarou transfers into the school and decides that he wants to be Kengo’s friend.

Kengo reveals to Gentarou that he must turn off the Zodiarts Switch used by the person who activated it in order to truly defeat a Zodiarts. As Gentarou and Yuki search the campus for the owner of the Zodiarts Switch, she begins to tell Gentarou more about Kengo and how he came to have the Fourze Driver and the Astro Switches.

When the annual Queen Festival comes around, Gentarou decides if he wants to befriend Kazashiro Miu, he must convince Yuki to enter a talent contest that Miu wins every year and beat her.

Gentarou decides to help Miu retain her title as Queen and Fourze goes after the Chameleon Zodiarts to protect Miu.

While Miu integrates herself with the group, JK finds himself being targeted by a Zodiarts and Gentarou finds the new Electric Switch difficult to use.

Gentarou finds out that JK was just using him for protection against the Zodiarts and has stolen the Electric Switch, but Gentarou is determined to show JK the power of friendship and help JK despite being tricked by him.

Kengo, Yuki, and Gentarou are forced to take supplementary lessons on a Sunday due to missing classes whilst defeating Zodiarts. Meanwhile, Shun grows angry with the Kamen Rider Club and Miu’s involvement with them. JK and Miu try and hold down the fort whilst the others are in class.

Gentarou, Miu, JK, and Yuki continue to track down the Hound Zodiarts, and Shun decides it’s time to make his own choices about his friends and school activities.

Tomoko tells the group that the end of the world is coming – and that she will become the Luna Witch. When three witches and Tomoko start performing magic around the school, the Kamen Rider Club must find out whether this is witchcraft or actually a Zodiarts.

Tomoko must decide whether to use a Zodiarts Switch to get her wish or help the others defeat the Zodiarts currently rampaging through the school.

Yuuki is targeted by a Zodiarts who is obsessed with her. Meanwhile, the locker which attaches the Rabbit Hutch to the school goes missing leaving Kengo trapped on the moon.

The Pyxis Zodiarts decides the only way to get revenge is to use his power to kill all the girls who rejected him, including Miu, by driving a bus with them all inside off of a bridge. Meanwhile, Kengo is still trapped in the Rabbit Hutch.

Gentarou and the others decide to bring back those students who were Zodiarts to the school, starting with Miura.

To save Miura from using a Zodiarts Switch again Gentarou must go up against one of the Horoscopes, Scorpion, an enforcer-type Zodiarts.

Yuuki is invited to join the Glee Club for a performance for the Kindergarten Class, however, her singing disrupts a fellow student in possession of a Zodiarts Switch.

The Perseus Zodiarts seems to be too powerful for Fourze to stop on his own, however, the appearance of a new Rider shifts the balance of the fight…

After Kengo reaches a dead end in finding out the identity of the mysterious new Rider, Ms. Sonoda introduces new transfer student, Sakuta Ryusei.

Ryusei tries to gain membership to the Kamen Rider Club to further his own agenda but whilst most of the Club is fine with a new member, Gentarou is against Ryusei joining…

Kengo has a fight with Gentarou due to his decision to let Ryusei help with adjusting the new Switches. But when Kengo joins the track team, Fourze finds himself heavily outmatched and Ryusei unable to fill Kengo’s role.

Gentarou and Kengo must find a way to overcome their rift and unlock Fourze’s Magnet States before a powerful Zodiarts defeats both Fourze and Meteor.

With Sonoda still absent from the school, Gentarou’s class gets a new homeroom teacher who is far more interested in kickboxing than teaching.

Gentarou and the others are convinced that their new homeroom teacher is the Zodiarts that is currently rampaging, however, Ryusei figures out that the culprit is not their teacher.

Gentarou and friends hear about a new hero from their classmate Norio Eguchi, who identifies the hero as Cygnus and also happens to be a member of the Ugly Duckling Society, a fan club dedicated to Cygnus. However, this new hero is not as good as he seems…

The gang must race to find out who the Switcher is – before the new ‘hero’ wipes out Fourze and Meteor to become the sole hero in the city…

Miu and Shun are due to graduate – however, it seems like it might not be smooth sailing as previous Zodiarts return once again…

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.

During Spring Break the gang decide to try and make the most of what should be a Zodiarts free time, however, Kijima tries to recruit Ryusei to his side whilst playing a deadly game with students, and those who don’t win are placed into permanent comas…

The Cancer Zodiarts threatens the members of the Kamen Rider Club now that he has attained the Supernova ability. Meanwhile, Ryusei discovers that Jirou’s condition has taken a turn for the worse, while Tachibana gives Ryusei one last chance to transform into Meteor and take out Kijima.

Gentarou and his friends enter the third-year class headed by Mr. Ohsugi, and Gentarou tries to befriend new first-year students Haru and Ran. However, Haru is given a Zodiarts Switch by the Libra Zodiarts…

Gentarou and the Kamen Rider Club must figure out how to deal with Haru as the Musca Zodiarts and Mr. Ohsugi’s discovery of the Rabbit Hatch, along with the latter’s confiscation of the 38th Astro Switch.

After the 39th and 40th Astro Switches are developed, Amanogawa and Subaruboshi High Schools hold a test transfer of some of AGHS’s students to SBHS, which causes problems when the Aries Zodiarts makes itself known to the AGHS students…

After Gentarou’s death at Ryusei’s hands, Kengo does not know how to resurrect him as the Aries Zodiarts takes the other Kamen Rider Club members captive. Elsewhere, having betrayed Tachibana, Ryusei is able to talk to the revived Jirou.

The third-year class goes on a field trip to Kyoto where they believe they will be free from the Zodiarts for once, but are ambushed by the Libra and Leo Zodiarts. While there, Kengo meets one of his father’s old friends. Meanwhile, a enamored girl is determined to snag Gentarou’s heart, and poor Yuki is forced to help…

The Kamen Rider Club must work to stop the Libra and Leo Zodiarts from destroying the last two altars in Kyoto that are regulating The Hole’s Cosmic Energy. In the process, Kengo finally learns the circumstances of his father’s death.

An internet radio show started up by the mysterious DJ Gene, soon discovered to be none other than JK, grabs the school by storm. He starts up a musical contest, which grabs the attention of the Kamen Rider Club and a fellow student who turns out to be the Capricorn Zodiarts, one of the new Horoscopes appearing at AGHS.

Fourze must defeat both the Capricorn Zodiarts and the Zodiarts’ song that has enraptured the school, but with Cosmic States out of commission after Gentarou’s bond with JK is severed, can he find a way to rebond and restore his power?

Gentarou, Yuuki, Kengo, Tomoko, Ryusei, student council president Sugiura, the former Pyxis Zodiarts Hiroki Makise, and transfer student Elleen Suda begin a training program in a closed environment and endurance test, but Kengo’s weak constitution and the arrival of the Aquarius Zodiarts cause trouble for the group.

Yuuki passes under suspicious means, while Gentarou tries to convince Elleen to not follow the path the Horoscopes want of her, as well as give up her hatred for Yuuki.

Acting student council president Sugiura institutes a new set of rules that all students have to follow, severely limiting the freedoms the school initially allowed them.

As the Taurus Zodiarts, Sugiura continues to stifle everyone’s creativity, but Ryusei, using Meteor to mask his identity, challenges him to a game of golf to get everything back to the way it was, while Gentarou and Yuuki try to find out why Yuuta had changed.

The Virgo Zodiarts begins attacking other members of the Kamen Rider Club, scaring them away from the club, blocking Fourze from accessing Cosmic States. However, Tachibana arrives on Earth to show Gentarou a way to fight with other abilities at his disposal.

With most of the Kamen Rider Club taken out of commission the Virgo Zodiarts, Gentarou and Kengo are on their own in their fight against Virgo after Meteor is sent to the Dark Nebula and the others distance themselves from the Club. And things get worse when the new powerful member of the Horoscopes, Sagittarius, appears…

Yuuki starts acting stranger than usual with strange incidents getting traced back to her. As Yuuki somehow transforms into the Gemini Zodiarts, Gentarou begins to suspect something’s not quite right.

The Kamen Rider Club work to save Yuuki from ceasing to exist as Fake Yuuki begins to take her place as the real Yuuki. As Gentarou suddenly realizes the nature of the forgotten promise, he rushes to stop the ceremony before Yuuki is gone forever.

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.

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.

With Gamou’s scheme to use all twelve Horoscopes Switches thwarted, Kengo reveals the truth of his origins to the Kamen Rider Club and his eventual parting with his friends. However, the Horoscopes attack the Rabbit Hatch to eliminate Kengo, getting the Kamen Riders to desperately fight back to protect their friend, who must go back to the Presenters.

With Kengo’s death at the hands of Sagittarius and the destruction of the Rabbit Hatch, a distraught Kamen Rider Club reads the final letter from the Core Child written before his death. A resolved duo of Riders must face the Horoscopes one last time to avenge their fallen friend and stop Gamou for good.