(ベストマッチな奴ら Besutomacchi na Yatsu ra)
A mysterious object known as the Pandora Box was brought back from Mars. In effect, Japan was divided into three by giant walls produced from the box. 10 years have passed since that day. This story takes place in one of the city capitals, Touto. Mysterious organisms known as Smash are terrorizing humanity. There was once a physicist who saved people from the Smash and pursued the mystery hidden within the Pandora Box. His name is Sento Kiryu. People called him... Kamen Rider.