Producer, Straight Edge founder, and former Dengeki Bunko Editor-in-Chief Kazuma Miki posted on his official Twitter account on Monday regarding the possibility of a third season of the A Certain Magical Index anime. He writes:

"Please understand that this is an unofficial statement. I am always receiving everyone's passionate opinions on this. Index anime [season 3] is plausible, so please wait!!"

A Certain Magical Index adapts Kazuma Kamachi's light novel series of the same name. The first television anime series premiered in 2008, and was followed by a second season in 2010, and the A Certain Magical Index: The Miracle of Endymion anime film in 2013. Motoi Fuyukawa's spinoff manga series A Certain Scientific Railgun also received a television anime series in 2009, and a second season titled A Certain Scientific Railgun S in 2013. Miki is credited as producer in all of the above anime.

Miki recently left his position as Editor-in-Chief of Kadokawa's Dengeki Bunko on March 31 to start a new company called Straight Edge alongside Kazutomo Suzuki, executive manager at Kadokawa's ASCII Media Works. The new company's focus will be on managing talent and producing content such as publications and animation. The new company has not announced plans to print its own titles. Among other writers, Straight Edge has a contract with A Certain Magical Index author Kazuma Kamachi.