Pre-production
A third film for Kamen Rider Den-O was initially announced on the Animate Online Store as part of a listing for a set of trading cards to promote the movie. The film was subsequently listed on various upcoming film lists, including those at AOL Japan's Entertainment page. These listings were soon removed, and the website "saraba-den-o.jp" appeared with a countdown timer to the website's official opening.
Read more about this topic: Saraba Kamen Rider Den-O: Final Countdown