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!
A special preview special released a few weeks before Kamen Rider Gavv's premiere, which revealed new details and unreleased footage featuring the next Kamen Rider, Kamen Rider Gavv.
The story takes place at Shido Academy, a boarding school for boys, and centers on Hayama Takumi, a lonely and shy boy who suffers from an extreme phobia of human contact and can't stand being touched by others. During his second year of study, Takumi has to share his room with Saki "Gui" Giichi. Gui was raised overseas and is the school idol due to his outstanding academic performance and good looks. One day, Gui confesses to Takumi that he has been in love with him for some time. This truth unsettles Takumi, but however, he comes to realize the true sensitivity of Gui's personality.
Yusuke Hino (日野友輔), formerly known as Yusuke Noguchi (野口友輔), is a Japanese actor and member of the idol boy group Hi☆Five.