とある科学の超電磁砲
is a Japanese manga series written by Kazuma Kamachi and illustrated by Motoi Fuyukawa, which began serialization in the April 2007 issue of ASCII Media Works' "Dengeki Daioh" magazine. The manga is a spin-off of Kamachi's "A Certain Magical Index" light novel series, taking place before and during the events of the main story. Seven Seas Entertainment began publishing the series in North America in June 2011. An anime television series adaptation by J.C.Staff aired in Japan between October 2009 and March 2010, followed by an original video animation released in October 2010. A second season titled "A Certain Scientific Railgun S" aired between April and September 2013. A spin-off manga series titled "" began serialization in "Dengeki Daioh" from April 2017 to July 2020. A third season titled "A Certain Scientific Railgun T" aired between January and September 2020.