Touma and his editor Mei, go to give a child a book for his birthday. After presenting the book to the child, the area ahead of them changes, separating the child from his parents.
Thanks to Touma transforming into Kamen Rider Saber, the city is returned back to normal. Rinataro Shindo enters Touma's bookstore, to reveal to Touma more information about the book monsters.
An ashamed Rintaro flees from the Northern Base after failing to protect Mei from the Megids. Faced with the fear of losing his friend, Touma confronts the enemy alone to rescue her, but Zooous stands in his way to prevent him.
Touma learns he is slowly vanishing as a result of his increasing power as Saber, which aligns with one of Kento's visions. Despite this, the latter continues on, intending to determine his story's ending himself.
As Storious' evil plan is progressing, he kidnapped Luna in front of Touma and Kento. Sophia joins the rest of nine swordsmen as the fourth Calibur for a final battle.
As Storious' plan progresses and Wonder World and Earth collapse, the swordsmen are unexpectedly joined by Sophia as the latest Calibur as well as Luna and Mei.
The source of the swordsmen's power and the source of stories, the Wonder World, disappears, and as the stories vanish from the world so does the world itself.
After saving Earth and Wonder World together, Touma and his friends enjoy a well-deserved rest and begin to go their separate ways. However, their peaceful days are interrupted by another strange monster they have never encountered before along with a human and a demon who can also transform into Kamen Riders.
