This is it. The Kamen Rider Saber starts today! When he was a child, Touma Kamiyama (神山 飛羽真 Kamiyama Tōma) eventually caught in the fight between the Sword of Logos (ソード・オブ・ロゴス Sōdo Obu Rogosu) and Megiddo. and he was rescued by the first Kamen Rider Saber (仮面ライダーセイバー Kamen Raidā Seibā), who has told him to decides the ending of the stories and entrusted him the Brave Dragon Wonder Ride Book. As a result, he lost his memories of his past and only reliving his past memories through dreams.

When the Megiddo began to attack once again and causing peoples and places vanished in an attempt to complete the book and creates a new world, Touma transforms into the new Kamen Rider Saber for the first time after the Brave Dragon Wonder Ride Book sensed his resolve to make people happy with the books.

After seeing Kamen Rider Saber are active once again, the treacherous Kamen Rider Calibur and Megiddo began their moves, knowing that the Sword of Logos will make a move as well...

https://youtu.be/0uB6QYrA0E0

In the next episode, Rintaro Shindo (新堂 倫太郎 Shindō Rintarō), a young man who is also happened to be a member of Sword of Logos, has appeared before Touma and revealed the unbelievable facts to the latter. Rintaro will transform into the Kamen Rider Blades (仮面ライダーブレイズ Kamen Raidā Bureizu), the secondary Kamen Rider of Saber. This also marks that Blades' Ride Gatriker is the first Rider Machine to be a three-wheeled motorcycle.