The movies were announced following the airing of Kiramager’s first episode.
Toei released teaser visuals for each movie. Zero-One’s features Kamen Rider Zero-One’s standing among the ruins of Hiden Intelligence’s headquarters with the text “You will participate in the end together,”. Kiramager’s features its main team along with the text “Sparkling in top gear! The most radiant summer!”
A special video was also released asking “Is the greatest enemy human, A.I., or…?”
Source: Eiga Natalie