October 5 to be exact
The official website for the new season of a Certain Magical Index has revealed that the new season will come in October 5.
Hiroshi Nishikiori is back again as the Director in Studio J.C. Staff; Hiroyuki Yoshino is in charge of the scripts ; Yuichi Tanaka is back as the character designer.
My Anime List describes the story as follows:
“Academy City, Japan, is at the forefront of science. Besides being 30 years ahead of the world technologically, more than three-fourths of this peculiar city’s population consists of students developing their psychic abilities as espers in various institutions. Among these students is Touma Kamijou, a high school boy with the lowest psychic rank of zero, but with a mysterious power no scientist can understand: “Imagine Breaker,” which allows him to negate other supernatural abilities.
This, however, doesn’t affect Kamijou’s life in the least as he plays his role as a regular teenager; that is, until he meets the strange Index Librorum Prohibitorum, a young girl who has memorized the entire forbidden grimoires, and now a dangerous organization is hunting Index down. With several magicians looking to harm the girl, Kamijou will defend his new companion at all costs as he discovers a strange new realm of the supernatural.”
Via: Crunchyroll Latín América (Spanish)