At the
Sword of Logos'
Agastya Base space station, the guardian
Asmodeus rebels and takes control of all the books containing the
Kamen Riders and
Super Sentai's stories, merging them into one story. Meanwhile,
Touma Kamiyama,
Mei Sudo, and
Yuri are transported to the world of
Kikai Sentai Zenkaiger while
Zenkaiger members
Kaito Goshikida,
Gaon,
Magine, and
Vroon are transported to the world of
Kamen Rider Saber. Kamiyama's group encounter
Juran while he is searching for his teammates, help him repel one of
Tozitend's attacks, and meet a young boy called Shotaro. Regrouping at the Zenkaigers' headquarters, they make contact with Goshikida's group through
Secchan and learn of what happened from
Sophia. Suddenly, Asmodeus uses his powers to send Goshikida and
Rintaro Shindo to a world based on
Journey to the West and Kamiyama, Juran, Sudo, and Shotaro to one based on
Nansō Satomi Hakkenden. With help from several Riders and Sentai warriors they meet along the way, both groups get to the end of their respective stories and reunite to confront Asmodeus. However, he convinces Shotaro that both the Riders and Sentai groups should not exist as they always suffer over the course of their stories. Shotaro destroys his drawings, causing the Riders and Sentai to disappear. While vanishing, Kamiyama discovers he and his friends were part of a story as well instead of the real world before waking up in a world where they live peaceful lives and the battles they faced never happened. Realizing that facing hardships is what makes heroes human and that Shotaro is actually a young, time-displaced
Shotaro Ishinomori, the creator of the Riders and Sentai's stories, Kamiyama finds and convinces him to create heroes again. Together, they create a new story called
Super Hero Senki. Concurrently, Asmodeus joins forces with the Riders and Sentai groups' enemies to take over the story worlds, only to be opposed by the Sword of Logos, Zenkaigers,
Twokaizer, and their Rider and Sentai predecessors, who destroy the villains while Asmodeus is defeated by
Kamen Rider Revice. Asmodeus absorbs his fallen allies' machinery to enlarge himself and transform into a dragon, but the Sentai warriors summon their mecha to join the Riders in destroying him. As the heroes return to their respective worlds,
Kamen Rider 1 recognizes Shotaro as his creator. Though the latter realizes he is at a point in time where he is already dead, he rejoices knowing that his creations will continue inspiring others long after his death and promises to fulfill his dream of making hero stories before returning to his time. The
Agastya Bases books are restored while Kamiyama, Sudo, and the Zenkaigers stop by the Colorful cafe to celebrate their victory and discuss Revi and Vice's story. ==Cast==