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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 Kashû
Shouichi Tsugami / Kamen Rider Agito
Jun Kaname
Makoto Hikawa / Kamen Rider G3-X
Yûsuke Tomoi
Ryo Ashihara / Kamen Rider Gills
Ryo Karato
Shiro Mizuki / Kamen Rider G4
Maju Ozawa
Risa Fukami
Rina Akiyama
Mana Kazaya
Touko Fujita
Sumiko Ozawa
Atsushi Ogawa
Tetsuya Sawaki
Jun Yamasaki
Toru Hojo
Kazumasa Taguchi
Koji Kono
Akiyoshi Shibata
Takahiro Omuro
Takeshi Masu
Yoshihiko Misugi
Shunsuke Nakamura
Customer in Hamburger Shop
Tsuyoshi Ujiki
Sayaka's father
Noriko Watanabe
Sayaka's mother
Hiroshi Fujioka
MPD Superintendent General
Kenji Anan
Ant Lords (voice)
Masahiro Noguchi
Senior Police
Shinji Matsubayashi
Risa Fukami's henchman
Kunihiko Yasui
Ant Lord Formica Pedes (voice)
Hiroyuki Shibamoto
Ant Lord Formica Eques (voice)
Hiromi Tsuru
Ant Lord Formica Regia (voice)