35x17 - Kamen Rider

Shoma, searching for a missing high school student, discovers that other "kind and gentle" people have been disappearing one after another. Are such people the only ones being targeted by the Granute? If so, Sachika is in danger! Shoma rushes to Sachika's side, but... Shoma and Hanto finally find the Granute and transform into Riders. Then a man in a hat appears. In front of Gavv and Valen, the man changes into Lage Nine and puts on a belt...!?