The manga series A Certain Scientific Railgun is written by Kazuma Kamachi and illustrated by Motoi Fuyukawa.
The manga is a spin-off of Kamachi's A Certain Magical Index light novel series published by ASCII Media Works.
Taking place in the futuristic Academy City where students learn to become espers with various powers, the story follows Mikoto Misaka, an electromaster who is the third most powerful of only seven Level 5 espers, and her friends, taking place before and during the events of A Certain Magical Index.
The first chapter of Railgun was published in the April 2007 issue of ASCII Media Works' Dengeki Daioh shōnen manga magazine, and the succeeding chapters are serialized monthly.
[2] Seven Seas Entertainment licensed the manga in English and began releasing the series in North America starting with the first volume in June 2011.