Gangan Online

Gangan Online (ガンガンオンライン) is a Japanese web manga magazine published by Square Enix. Two chapters of Toaru Nichijou no Index-san are released every month, one in Monthly Shōnen Gangan, and the other in Gangan Online later in the month.

History
The online web magazine was activated on October 2, 2008.

List of works

 * Toaru Nichijou no Index-san (2013-2016)