The looming threat of monsters. Granutes, monsters from another world. Humans have no idea they are secretly coming to their world. Humans have no idea their kind are being hunted.

One young man steps up to protect humanity. Shoma is a young man who loves to eat. By eating treats, he can create beings known as the Gochizo that become his companions and his main source of power as Kamen Rider Gavv. The story of Shoma, who fights to protect people's happiness from the Granute, begins now!