An amnesiac, happy go lucky youth named Shoichi Tsugami uses the power of Agito to unravel his mysterious past and battle beings known as Unknowns. In response to the Unknown threat, the police unleashed their newest weapon, the G3 powersuit primarily used by Makoto Hikawa. More mysteries unfold with the appearance of Ryo Ashihara, who transforms into a pre-Agito known as Gills. He seeks the truth about his father's suicide. These mysteries and others collide, as the true nature of Agito would ultimately determine the fate of humanity.
as Shoichi Tsugami / Kamen Rider Agito
as Makoto Hikawa / Kamen Rider G3 / Kamen Rider G3-X
as Ryo Ashihara / Kamen Rider Gills
as Mana Kazaya
as Yoshihiko Misugi
as Taichi Misugi
as Kaoru Kino / Kamen Rider Another Agito
as Sumiko Ozawa
as Toru Hojo
as Takahiro Omuro
as Koji Kono
as Mysterious Youth / Overlord
as Tetsuya Sawaki
as Koji Majima
as Narration (voice)
