Toaru Project

The Toaru Project (とあるプロジェクト) is an upcoming series of media releases related to the Toaru Majutsu no Index franchise. The project will begin on 2018, and includes a third season of the Toaru Majutsu no Index anime series.

Development
The Toaru Majutsu no Index light novel series, written by Kamachi Kazuma and illustrated by Haimura Kiyotaka, was adapted into an anime series between 2008 and 2011 and a theatrical release on 2013. Its main spinoff, Toaru Kagaku no Railgun, was also adapted into an anime series between 2009 and 2013. After the TV airing of the second season of Toaru Kagaku no Railgun, the series entered a period where no animated media related to both series was released; instead, another of Kamachi's works, Heavy Object, was greenlit for an anime adaptation during the 10th year anniversary of Kamachi Kazuma's career as a light novel author.

Between the years 2014 and 2016, Dengeki Bunko's editor Miki Kazuma appeared during the biannual Dengeki Bunko Festival and urged fans of the franchise to wait for any further developments. On March 2017, Index was involved in a crossover project with Sega's Dennou Senki Virtual-On video game franchise, spawning the Toaru Majutsu no Virtual-On light novel,  and later videogame. On October 1, 2017, Miki Kazuma appeared at the Dengeki Bunko Autumn Festival 2017 to announce the Toaru Project, as well as the confirmation of a third season of Toaru Majutsu no Index.

Words of encouragement

 * Kamachi Kazuma: "Finally did season 3! Long or not long... Honestly, it was long, but animation technology has rapidly advanced. So lets aim at what you think is good!"
 * Miki Kazuma: "It's been 4 years since the movie. It's finally starting again with Index III! However, with the labeling of Toaru PROJECT, it won't just stop with Index III! We have various plans in place! Lastly, a couple of words: 'Everyone, kept you waiting, huh? This is the best climax ever!' I'll be doing my best so please support us!"

Toaru Majutsu no Index Season 3
A third season of the Toaru Majutsu no Index anime series was greenlit during the Dengeki Bunko Autumn Festival 2017. Voice actors Abe Atsushi and Iguchi Yuka will reprise their roles as Kamijou Touma and Index respectively. This, coupled with the fact that Othinus and Lessar's seiyuus were revealed in the Toaru Majutsu no Virtual-On videogame, two characters who up to that point had were only light novel-exclusive, as well as the Toaru Majutsu no Index mobile MMO showing light novel-exclusive content, made it clear that the upcoming third season would soon be imminent.

Early in June 2018, more of the cast were revealed, with Satou Rina, Okamoto Nobuhiko, and Hino Satoshi are all reprising their roles as Misaka Mikoto, Accelerator, and Hamazura Shiage respectively. Moreover, a new key visual for the upcoming season was revealed, prominently showing important characters including Hamazura Shiage, as well as the new logo, making Toaru Majutsu no Index III the official title of the sequel. The sequel will premiere on October 2018.

On July 8, 2018, the PV for the third season was released at Anime Expo 2018 held in Los Angeles and later uploaded to Youtube on the official channel. The video reveals that will be returning to compose for the series, and that it will premiere in October on Tokyo MX and other channels.