Story : Shoma starts a new life at Sachika's "Happipare". Meanwhile, Suga has succeeded in developing an item that can transform a person into a Kamen Rider, and asks Hanto to try it out. A new Granute appears. Shoma transforms into Gavv and fights to his advantage, but the Granute counterattacks and escapes. Hanto stood in front of the Granute and transforms into Kamen Rider Valen with an item developed by Suga...!