Koushiki Comic Anthology: Toaru Kagaku no Railgun featuring Toaru Majutsu no Index

The Koushiki Comic Anthology: Toaru Kagaku no Railgun featuring Toaru Majutsu no Index (公式コミックアンソロジー とある科学の超電磁砲 featuring とある魔術の禁書目録) is an official anthology comic series based on Toaru Kagaku no Railgun and Toaru Majutsu no Index. Two volumes were released under the Dengeki Comics EX label, both in 2013. Both have a collection of stories created by various mangaka and artists.

Background
The first volume was released on July 27, 2013. The second volume was released on September 27, 2013.