Monsters known as Mimics have invaded Canterlot and wish to wipe out humanity. Only a select group of heroes are able to stand against them. The Kamen Riders.
18 years ago, a strange, celestial body crashed just on the outskirts of Canterlot. A mysterious box was found and studied in the Canterlot Research Facility. Despite the time and effort, its secrets have yet to be unearthed....until now.