A near-future America, rebuilding from the devastation of a mysterious energy disaster known as the Skywall Incident, which divided the nation into three warring territories. The source of the catastrophe: the Pandora Box , an alien artifact that discovered on the planet Mars and was exploited for personal gain before spiraling into chaos. Ethan Cross, a brilliant but amnesiac physicist transform into kamen rider build to fight against monsters know as smash that created by terrorist organization know as Faust whose might cause his memory lost.
