The battle finally begins! Friend or foe? The strongest new Rider appears.
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.
Toshiki KashûShouichi Tsugami / Kamen Rider Agito
Jun KanameMakoto Hikawa / Kamen Rider G3-X
Yûsuke TomoiRyo Ashihara / Kamen Rider Gills
Ryo KaratoShiro Mizuki / Kamen Rider G4
Maju OzawaRisa Fukami
Rina AkiyamaMana Kazaya
Touko FujitaSumiko Ozawa
Atsushi OgawaTetsuya Sawaki
Jun YamasakiToru HojoAkira HaneoMysterious Youth
Kazumasa TaguchiKoji Kono
Akiyoshi ShibataTakahiro OmuroTokimasa TanabeTaichi Misugi
Takeshi MasuYoshihiko MisugiAkane KimuraSayaka Kahara
