In October 2020, Kamen Rider Saber: The Movie was announced to premiere double-billed with Kamen Rider Zero-One: The Movie, in lieu of both Mashin Sentai Kiramager: The MovieIcon-crosswiki.png and a Movie War crossover. In the same month, plot details, production images, and special cast members regarding Kamen Rider Saber: The Movie were revealed. In November, the film's official title was revealed to be Kamen Rider Saber: The Phoenix Swordsman and the Book of Ruin, promoted alongside Zero-One's film in the marketing campaign titled Kamen Rider Splendid Double-Feature (仮面ライダー 超豪華2本立て Kamen Raidā Chōgōkai ni-hondate). Ticket pre-sales began on November 8, 2020, with online purchases including digital downloads of episodes of both Zero-One's anime and Saber's anime. Both films premiered side-to-side in Japanese theaters on December 18, 2020.