Shouichi encounters a teenage girl called Sayaka, who ran away from a military facility because of an attack by the Ant Lords. Sayaka has a supernatural ability to foresee the future. Risa Fukami, of the military group GA, wants to use that power to enhance the newly-made G4 System, which was based upon designs stolen from Ozawa. Now, Agito and Gills must fight to stop the Ant Lords' attack, as G3 and G4 settle their score.
賀集利樹
as Shouichi Tsugami / Kamen Rider Agito
要潤
as Makoto Hikawa / Kamen Rider G3-X
友井雄亮
as Ryo Ashihara / Kamen Rider Gills
唐渡亮
as Shiro Mizuki / Kamen Rider G4
小沢真珠
as Risa Fukami
秋山莉奈
as Mana Kazaya
藤田瞳子
as Sumiko Ozawa
小川敦史
as Tetsuya Sawaki
山崎潤
as Toru Hojo
Rei Haneo
as Mysterious Youth
田口主将
as Koji Kono
柴田明良
as Takahiro Omuro
