There is one of the light novels from the interlude story in the To Aru no Index series entitled To Aru No Railgun or A Certain no Railgun which is now getting an anime adaptation for its fourth season entitled F or “Fourth”, for the studio itself it will be done by the J.C Staff studio which is currently working on an anime entitled Danmachi V, which is being re-aired because of improvements to the animation.
Moreover, the story of the anime To Aru No Railgun or A Certain no Railgun F will continue, the story about what happened previously, namely a little romance between Misaka Makoto and Kamijou Touma later, but the story will focus on characters named Misaka Makoto, Shirai Kuroko Saten Ruiko, and Uiharu Kazari later as the 4 main characters in this story. When it is broadcast again, the production committee itself will remain in the hands of NBC Universal in the future.
In total, 24 episodes will be broadcast, like the previous 3 seasons which will focus on the school, which is often the source of the problem because it is often the subject of trials by several other scientists in this remote academy school only specifically for elementary – high school children.