Granutes are intelligent lifeforms that operate secretly in the human world. They kidnap people for the sake of "Black Market Sweets." As people are attacked one after another by the Granutes, Shoma, a young man from another world, rises up to save the people. Together with the Gochizo, small monsters born from eating sweets, he transforms into Kamen Rider Gavv with a mouth-like belt!
Shoma / Kamen Rider Gavv
Hanto Karakida / Kamen Rider Valen
Sachika Amane
Rakia Amarga / Kamen Rider Vram / Rage9
Glotta Stomach
Nyelv Stomach
Jeebh Stomach
Siita Stomach
Lango Stomach
Kenzo Suga
Agents (voice)
Gochizo (voice)