* Based on the Toaru Kagaku no Railgun manga written by Kamachi Kazuma and illustrated by Fuyukawa Motoi, which in itself is a spin-off of the light novel, manga and anime series Toaru Majutsu no Index.

An enormous city with a population of 2.3 million spreads out over western Tokyo. In this metropolis, known as "Academy City" due to roughly 80% of the population being students, the development of supernatural abilities - anomalous phenomena which turn the world's natural laws on their ear - was taking place. Students who underwent the unique curriculum and attained esper abilities were subjected to a System Scan, a physical examination which scored them into one of six rankings, from the powerless Level 0 to the super-powered Level 5.

There are seven individuals who are considered to have reached this pinnacle super-powered level. One of them is Misaka Mikoto.

Nicknamed "Railgun" thanks to her status as the highest-ranked user of "Electromaster," the ability to freely control electricity, Mikoto is a 14-year-old who attends the prestigious all-girl Tokiwadai Middle School. One of her underclassmen is Shirai Kuroko, a member of the disciplinary organization Judgment. Uiharu Kazari is her colleague, who aspires to be a proper lady, and the urban-legend-loving Saten Ruiko is their friend.

The Daihasei Festival, an event held once a year, loomed large over the peaceful, run-of-the-mill, ever-so-slightly unusual daily life enjoyed by the girls. It was an athletic festival held over the span of seven days, which pitted esper schools against each other in fierce competition. A portion of Academy City was opened up to the public for the duration of the festival, and everyone was in high spirits during the lead-up to the event, which would be telecast for the whole world to see. But they were completely unaware of what was in motion behind the city's festive scenes...

Source: crunchyroll

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Prequel: Toaru Kagaku no Railgun S