This year's November issue of Kadokawa's Monthly Comic Dengeki Daioh magazine revealed on Friday that the third season of A Certain Scientific Railgun (Toaru Kagaku no Railgun) anime will premiere in January 2020. The anime will air in Japan on AT-X, Tokyo MX, MBS, BS11, and Abema TV.
fripSide are performing the opening theme song, and Kishida Kyōdan & The Akeboshi Rockets are performing the ending theme song.
The staff announced the new season at the "Dengeki Bunko 25th Anniversary Fall Dengeki Festival" event in October 2018. The anime was originally slated to premiere in 2019.
Tatsuyuki Nagai is returning to direct the anime at J.C. Staff. Shogo Yasukawa is in charge of series composition. Kentaro Izumi is the art director, Jin Aketagawa is the sound director, and Shingo Fukuyo is returning as the director of photography. Yuichi Tanaka is returning as the character designer, Tomomi Andō is returning to work on color design, and Maiko Iuchi is returning to compose the music.
The cast includes:Rina Satou as Mikoto Misaka Satomi Arai as Kuroko Shirai Aki Toyosaki as Kazari Uiharu Kanae Itō as Ruiko Saten Azumi Asakura as Misaki Shokuhō
Kamachi's A Certain Magical Index light novel series has inspired three television anime series, a 2013 anime film, and multiple manga adaptations. Motoi Fuyukawa's A Certain Scientific Railgun spinoff manga has also inspired two television anime adaptations and an original video anime (OVA).
The television anime of A Certain Scientific Accelerator (Toaru Majutsu no Index Gaiden: Toaru Kagaku no Accelerator) manga premiered in Japan on July 12. Crunchyroll and Funimation streamed the series as it aired in Japan.
Yen Press is releasing the original light novel series in English, and Funimation has released all of the anime adaptations in North America outside of the A Certain Scientific Railgun OVA. Seven Seas Entertainment is releasing the A Certain Scientific Railgun manga and the A Certain Scientific Accelerator manga in English, and Yen Press is releasing the A Certain Magical Index manga in English.
Source: Monthly Comic Dengeki Daioh November issue