A millennia has past since Kamen Riders as you know them. Technology has changed but the world has not. There is still chaos running rampant and heroes of Justice who stop the chaos. They call themselves Kamen Riders.

Kamen Riders have become a day to day occurrence as both the good, the evil, and the civilians now own Rider Belts. Some of the belts are mass-produced (yet altered) versions of past belts while others are custom-made to that user's desires.

Once every four years, Kamen Riders far and wide are called to Tokyo, Japan to fight in a mass battle festival called the Mirai Taisen, or "The War of All Time." Good Riders, bad Riders and those inbetween all convene in one city so one can be crowned The Rider Above All Riders and gets a chance to harness the pure power of all riders of the past (something that no champion of the Mirai Taisen has achieved.)

With those who wish to harness the past Rider powers for good or evil, a strange set of rules set in place, and no clear victor in sight, what will be the outcome of the newest Mirai Taisen?