Toaru Nichijou no Index-san

A Certain Everyday Index-san or Toaru Nichijou no Index-san (とある日常のいんでっくすさん) is the 4th manga series that is based off the Toaru Majutsu no Index franchise. Artwork is done by Mijin Kouka.

It began serialization on Monthly Shōnen Gangan alongside the Toaru Majutsu no Index Manga and the Toaru Majutsu no Index: Miracle of Endymion Manga on September 12, 2013. Two chapters are released every month, one in Monthly Shōnen Gangan, and the other in Gangan Online much later in the month as a webcomic.

Background
The manga follows the adventures of the characters of the world of Toaru Majutsu no Index as they stumble into hilarious shenanigans in 4 panels. Along with many other previews, the first chapter preview of the 4-koma manga can be viewed on the Toaru Kaki no Campaign website.