Kazuma Kamachi's Toaru Majutsu no Index Gaiden: Toaru Kagaku no Railgun (A Certain Scientific Railgun) will conclude in the May issue of Dengeki Daioh on Thursday. The series, which began serialization in 2007, brings its nearly 19-year run to a close.

Kamachi launched the sci-fi comedy spin-off manga in Dengeki Daioh in April 2007, with illustrations by Motoi Fuyukawa. ASCII Media Works published the 20th volume in June 2025, with the 21st and final volume scheduled for release on March 27.

J.C.Staff adapted the manga into a 24-episode television anime in Fall 2009, followed by an original video animation in September 2010. The second season aired for 24 episodes in Spring 2013, and the third season premiered in Winter 2020. A fourth season was announced in February 2025. Funimation licensed and simulcasted the series, providing both subtitles and an English dub.

Seven Seas Entertainment licensed the manga in English in June 2011 and released the 19th volume in February 2025.

Synopsis
Thirty years ahead of the rest of the world scientifically and home to millions of students enrolled in the esper development program, Academy City never sees a dull moment. Here, espers are given one of five power levels, the highest of which consists of only seven members. Mikoto Misaka, a middle school electromaster, ranks third among these individuals, and is known as "The Railgun."

In a city known for housing extraordinary individuals, it comes as no surprise that extraordinary things tend to happen. Recently, makeshift bombs disguised as everyday objects have been ominously finding their way into public areas. Mikoto's best friend, Kuroko Shirai, has been investigating the case as a member of the student-based disciplinary committee Judgement. As more and more of these incidents come to light, it becomes apparent that a hidden darkness exists within Academy City, one that may not only impact Mikoto and her friends, but also the fate of the city itself. [Written by MAL Rewrite]

Source: Oricon News