- Hiroaki Murakami (Kamen Rider 1979's Hiroshi Tsukuba/Skyrider) as Heisuke Satonaka, CTU's (Counter Terrorist Unit) Tokyo General Manager
- Yuma Ishigaki (Metal Hero's Geki Jumonji/Space Sheriff Gavan Type G) as Toru Mikami, CTU's Third Branch Investigator
- Shiro Sano (Kamen Rider Heisei Generations' Dr. Pac-Man, Kishiryu Sentai Ryusoulger's Valma) as Genji Onitsuka, CTU Tokyo HQ's 1st Branch Manager
- Atsuhiro Inukai (Sento Kiryu/Kamen Rider Build) as Go Samejima, a beautiful but selfish man who is Miyu's best friend
- Miki Yanagi (Doubutsu Sentai Zyuohger's Sela/Zyuoh Shark) as Suzu Hakozaki, a free spirited girl, she is one of Miyu's friends
- Yu Kamio (Kamen Rider OOO's Dr. Maki, Ultraman X's Shotaro Kamiki) as Yogo Hakozaki, who will help with the search of a missing daughter that went out at night
- Yasuyuki Maekawa (Kamen Rider Build's Souichi Isurugi/Evolto, Ultraman Orb: The Origin Saga's Shinra) as Tsunehiko Minagawa, an international photographer
Meanwhile, Urara Asakura (played by Gokusen's Yukie Nakama) is the leader of the Minsei Party. Having the strong support from the people, it is expected that she'll become Japan's first female prime minister. On the day of the election for the Prime Minister office, an assassination plot for her life is revealed. Genba must stop this attempt, but his daughter is also kidnapped at the same time.
24 Japan is set for an October 4th premiere on TV-Asahi and is set to have a total of 24 episodes.
[Source: AsianWiki (link 2)]