It was announced during the Dengeki Bunko 25th Anniversary Fall Dengeki Festival (try saying that five times fast!) that Toaru Kagaku no Railgun (A Certain Scientific Railgun) has been green-lit for a third television anime season! While no announce date has been given, a key visual and a promotional video were shown which you can view below.
MyAnimeList describes the story of Toaru Kagaku no Railgun as follows:
The student-filled Academy City is at the forefront of scientific advancement and home to the esper development program. The seven “Level 5” espers are the most powerful in Academy City, and ranked third among them is middle schooler Mikoto Misaka, an electricity manipulator known as “The Railgun.”
When strange incidents begin occurring throughout the city, she finds each crime to be connected to the elusive “Level Upper,” a legendary device that allegedly increases the esper level of its user. As the situation escalates, it becomes apparent that there is more to the Level Upper than meets the eye, and that Academy City may be a far more twisted place than the glamorous utopia it appears to be.
Toaru Kagaku no Railgun focuses on Mikoto and her friends—and the dangerous situations they find themselves in—as they get caught up in the matter of the Level Upper. As Mikoto says, “There’s never a dull moment in this city.”