is a Japanese tokusatsu series that serves as the 31st installment in the Kamen Rider franchise and the second entry in the Reiwa era.
Main characters Touma Kamiyama is a novelist who becomes the new after receiving a red Wonder Ride Book from Daichi Kamijo. When he was nine, Touma befriended Luna and Kento. When Kento's father Hayato defected to the Megids and kidnapped Luna, she and Touma tried to escape. While he was unable to save her, he was saved by Daichi, who told Touma he can decide stories' endings before giving the boy his Brave Dragon Wonder Ride Book. In the aftermath, Touma lost much of his childhood memories, but suffered recurring nightmares about Luna. Despite this, he remembered Kento's suggestion to become a novelist and opened an antique bookstore called the .
In the present, as his home city is attacked by a monster from Wonder World, Touma activates the Wonder Ride Book in his possession and transforms into the new Kamen Rider Saber. Amidst his battles against the Megids, Touma discovers a strange connection to the mysterious Kamen Rider Calibur before discovering Daichi had become Calibur and betrayed the Sword of Logos. After Kento's apparent death and defeating Calibur, Touma eventually recovers his lost memories. While investigating conspiracies within the Sword of Logos, Touma is falsely branded a traitor by members of the organization's Southern Base and forced to go AWOL with Mei and Yuri. As his allies learn the truth however, Touma slowly reconciles his friendships with them. After rescuing Luna from the world of Void, she chooses Touma to wield Wonder World's power and become its guardian, which he accepts despite the risk of fading from existence. While fighting Storious, Touma acquires the Wonder Almighty Wonder Ride Book, which allows him to defeat the Megid, undo Storious' damage to Wonder World and Earth, revive himself, and freely visit his friends on Earth without vanishing. Touma later semi-retires from being Saber so he can resume his work as a novelist.
During the events of the film Kamen Rider: Beyond Generations, Touma comes out of retirement at Rintaro and Sophia's behest, reunites with their comrades of the new Sword of Logos, and joins forces with the Igarashi siblings and Fenix commander, Hiromi Kadota, to combat Diablo and the Crispers.
Utilizing the Wonder Ride Book in conjunction with the SworDriver and the pyrokinetic knightly sword, Touma can transform into Kamen Rider Saber. While transformed, he gains the use of the familiar for combat assistance. His personal vehicle is the motorcycle, which is summoned from the eponymous Wonder Ride Book. He can also combine Brave Dragon with up to two other Wonder Ride Books to achieve the following forms: : A Wonder Rider accessed from the Brave Dragon and Jackun-to-Domamenoki Wonder Ride Books that grants similar capabilities as Ryo's Genbu Jackun form. : A Wonder Rider accessed from the Brave Dragon and Peter Fantasista Wonder Ride Books that grants similar capabilities as Rintaro's Lion Fantasista form. : A Wonder Rider accessed from the Brave Dragon and Needle Hedgehog Wonder Ride Books that grants similar capabilities as Kento's Lamp Do Hedgehog form. : A Wonder Rider accessed from the Brave Dragon, Needle Hedgehog, and Peter Fantasista Wonder Ride Books. : An auxiliary form accessed from the Brave Dragon and Wonder Ride Books that grants a pair of and the ability to conjure tornadoes and/or fire whirls. : An enhanced version of Touma's Dragon Eagle form accessed from the Brave Dragon, Storm Eagle, and Kobuta 3 Kyoudai Wonder Ride Books that grants similar capabilities as Ren's Ninja Butasan form. : An enhanced version of Touma's Dragon Eagle form accessed from the Brave Dragon, Storm Eagle, and Wonder Ride Books that grants similar capabilities as his Dragon Arthur form. : A Wonder Rider accessed from the Brave Dragon and King of Arthur Wonder Ride Books that grants the use of the sword, which allows Touma to summon and control a giant-sized copy of the aforementioned weapon. He can also transform the giant King Excalibur into a mecha also known as King of Arthur, which wields the sword, as well as transform himself into the flaming sword to be used by the aforementioned mecha. : A Wonder Combo accessed from the Brave Dragon, Storm Eagle, and Wonder Ride Books that grants the ability to conjure Sun Wukong's Ruyi Jingu Bang. : An auxiliary form accessed from the Brave Dragon and Saiyuu Journey Wonder Ride Books that grants the ability to conjure Sun Wukong's Flying Nimbus for Touma to ride into battle. : A Wonder Rider accessed from the Brave Dragon and Bremen no Rock Band Wonder Ride Books that grants similar capabilities as Tetsuo's Hansel Bremen form. : A Wonder Rider accessed from the Brave Dragon and Lamp Do Alangina Wonder Ride Books that grants similar capabilities as Kento's Lamp Do Alangina form. : Touma's super form accessed from the eponymous sentient Wonder Ride Book combined with Brave Dragon that grants the use of the familiar for combat assistance. Due to its traumatic past, Primitive Dragon initially possesses Touma and fights in a feral manner. After Touma befriends it, the Wonder Ride Book allows him to utilize its powers freely. This form can also be used with other Wonder Ride Books, such as Lion Senki. Primitive Dragons human form is portrayed by . : A special form accessed from the Brave Dragon and Wonder Ride Books that equips Touma with a left forearm-mounted blade. This form appears exclusively in the Hyper Battle DVD special Gather! Hero!! The Explosive Birth of Dragon Televi-Kun.
Additionally, Touma can assume the following forms by using unique Wonder Ride Books in place of Brave Dragon: : An evolution of Touma's Brave Dragon form accessed from the eponymous Wonder Ride Book that grants the ability to summon the God Beast Brave Dragon for him to ride into battle. In this form, he is equipped with the gauntlet, which allows him to perform enhanced attacks. : An evolution of Touma's Primitive Dragon form accessed from the Primitive Dragon Wonder Ride Book combined with the Wonder Ride Book that grants the use of the familiar for combat assistance and control over the elements of fire, water, lightning, earth, and wind. He can also lend Elemental Dragon to any of his allies with a corresponding element to enhance their own powers. : An evolution of Touma's Brave Dragon form accessed from the eponymous Wonder Ride Book that grants the use of the God Beast Brave Dragon, , and familiars for combat assistance. In this form, he is equipped with the left forearm-mounted . This form first appears in the film Kamen Rider Saber Theatrical Short Story: The Phoenix Swordsman and the Book of Ruin. : An enhanced version of Touma's Rider form accessed from the Wonder Ride Book that grants the combined powers of all the Wonder Ride Books. : A Kamen Rider Ghost-themed special form accessed from the eponymous Wonder Ride Book that grants the use of the 15 heroic Eyecons' Hoodie Ghosts for combat assistance. This form appears exclusively in the web-exclusive crossover series Kamen Rider Saber × Ghost. : A Zenkaizer-themed special form accessed from the eponymous Wonder Ride Book that grants the combined powers of all the main heroes of both the Kamen Rider and Super Sentai franchises. This form appears exclusively in the crossover film Saber + Zenkaiger: Super Hero Senki. : A special form accessed from the eponymous Wonder Ride Book. This form appears exclusively in the stage show Kamen Rider Saber: Final Stage.
After combining the powers of all 11 Seiken, Touma acquires a secondary Seiken called the , which he can use in conjunction with Brave Dragon and the SworDriver to transform into his final form; . While transformed, he gains control over all of the Seiken and their elemental powers. Similarly to his previous forms, he can also combine Brave Dragon with up to two other Wonder Ride Books to achieve the following forms: : A variant of Kamen Rider Xross Saber accessed from the Brave Dragon, Storm Eagle, and Saiyuu Journey Wonder Ride Books that grants similar capabilities as Touma's Crimson Dragon form. : A variant of Kamen Rider Xross Saber accessed from the Brave Dragon, Lion Senki, and Lamp Do Alangina Wonder Ride Books that grants the combined powers of the Kaenken Rekka, Suiseiken Nagare, and Raimeiken Ikazuchi. Rintaro and Kento can also share this form's power through their respective personal Wonder Ride Books.
Touma Kamiyama is portrayed by . As a child, Touma is portrayed by in the series and in the V-Cinema Kamen Rider Saber: Trio of Deep Sin.
Mei Sudo is a new editor of who is in charge of publishing Touma's work. After Touma joins the Sword of Logos, Mei decides to help his ally Rintaro adjust to modern life and receives a special white book she can use to alert Touma and his allies to Megid attacks. Eventually, Mei begins a relationship with Rintaro and goes on to become a successful editor.
Mei Sudo is portrayed by . As a child, Mei is portrayed by .
Rintaro Shindo is the current and student of Kenshin Nagamine before the latter was killed by Zooous, whom Rintaro developed a vendetta against. After meeting Touma, he senses the novelist's ability and asks him to join the Sword of Logos. When Touma becomes the new Kamen Rider Saber, Rintaro decides to stay in and work at the former's bookstore, developing a relationship with Mei along the way. Following the Sword of Logos' final battle with the Megid Storious, Rintaro is elected to become part of the organization's new ruling council.
Utilizing the Wonder Ride Book in conjunction with the SworDriver and the hydrokinetic knightly sword, Rintaro can transform into . While transformed, he gains the use of the familiar for combat assistance. He possesses a magical cellphone called the , which is capable of transforming into the reverse motor trike equipped with a pair of Gatling guns. He can also combine Lion Senki with up to two other Wonder Ride Books to achieve the following forms: : An auxiliary form accessed from the Lion Senki and Wonder Ride Books that grants the ability to open portals and the use of the familiar for combat assistance. In this form, Rintaro is equipped with the left forearm-mounted extendable . : A Wonder Combo accessed from the Lion Senki, Peter Fantasista, and Wonder Ride Books that grants flight capabilities.
Additionally, Rintaro can assume the following forms by using unique Wonder Ride Books in place of Lion Senki: : An evolution of Rintaro's Lion Senki form accessed from the eponymous Wonder Ride Book that grants the use of the ability to transform into an Animal Lion Senki-like state. In this form, he is equipped with the twin shoulder-mounted , which allow him to fire streams of pressurized water, and the gauntlet, which similar to the Dragonic Booster allows him to perform enhanced attacks. : Rintaro's final form accessed from the eponymous Wonder Ride Book that grants cryokinesis and the ability to summon the souls of deceased swordsmen, such as his teacher, for combat assistance. : A Kamen Rider Specter-themed special form accessed from the eponymous Wonder Ride Book that grants the use of the Deep Slasher. This form appears exclusively in the web-exclusive crossover series Kamen Rider Specter × Blades.
Rintaro Shindo is portrayed by . As a child, Rintaro is portrayed by in the series and in the V-Cinema Kamen Rider Saber: Trio of Deep Sin.
Kento Fukamiya