The Book of Ruin, which should have been sealed, is released along with the mysterious immortal swordsman, Bacht. Darkness overflows from the book, causing the real world and Wonder World to disappear. Touma Kamiyama, alongside members of the Sword of Logos, challenge Bacht to a decisive battle in order to stop this situation.

A recorded version of the Kamen Rider Saber: Final Stage event that took place at the Nakano Sunplaza Hall in Tokyo from October 16-17, 2021. Taking place after the events of the series, the Kamen Riders who are protecting the world with their Sacred Swords gather again in a brand new adventure!