10 years ago, the Pandora Box was discovered on the planet Mars and brought forth a catastrophe that would forever change the country of Japan. In the years following the Sky Wall Disaster, the rising of the Sky Wall divided the country into three warring territories: Touto (Eastern Capital), Hokuto (Northern Capital) and Seito (Western Capital), and created a series of unidentified monsters known as Smash that relentlessly attack the public. To combat this chaos, the Touto government requested the help of Sento Kiryu, a genius and prodigious physicist to help decipher the mysteries left behind by both the Pandora Box and the Smash. Alongside prison escapee Ryuga Banjo, who was wrongfully framed for a murder he did not commit, the duo embark on a journey as Kamen Riders to uncover the mysteries surrounding the Pandora Box, the Smash, and their own pasts. Their journey would not come easy as they face adversaries from Hokuto and Seito, whom they must ultimately confide in if they are to have any hope in stopping their mutual enemy, Evolto from destroying the planet that they hold dear.