At Dengeki Autumn Festival 2017, Kazuma Miki confirmed that A Certain Magical Index would receive a season 3 in 2018. The anime will premiere as a part of “A Certain Project 2018.”
You can check out the announcement trailer below.
Atsushi Abe (voice of Kamijo Toma) and Yuka Iguchi (voice of Index) confirmed that they would be reprising their roles in the third season.
A Certain Magical Index is written by Kazuma Kamachi and illustrated by Kiyotaka Haimura. The light novel ran for a total of 25 volumes and now has a sequel series in publication. The sequel is written and illustrated by the same team and is titled New Testament: A Certain Magical Index.
The light novel series is very popular and has spawned multiple anime as well as two spin-off manga. The original light novels received three anime adaptations which included two seasons of TV anime and an animated film. The film was released in 2013 and was titled A Certain Magical Index: The Movie – The Miracle of Endymion. It has been 4 years since we have last seen an anime based on the original light novels.
The manga spin-off, A Certain Scientific Railgun, has also been adapted into two anime seasons. The second spin-off, A Certain Scientific Accelerator, has yet to receive an anime.