A new novel series for the A Certain Magical Index franchise titled "To Aru Anbu no ITEM" (A Certain ITEM of the Dark Side) is set to be launched in March 2023. The series will be illustrated by Nilitsu and published by Kadokawa under the Dengeki Bunko imprint.The story follows the female characters of Academy City's "dark side". The A Certain Magical Index franchise has previously inspired three television anime series, a 2013 anime film, and several manga adaptations. Yen Press is releasing the original light novel series in English, while Funimation has released most of the anime adaptations in North America. The A Certain Scientific Railgun spinoff manga has also been adapted into three television anime series and an OVA, and has been released in English by Seven Seas Entertainment and Yen Press. A Certain Scientific Accelerator, a spinoff manga about the A Certain Magical Index character Accelerator, was released in English by Seven Seas Entertainment and received a television anime adaptation in 2019. A new spinoff manga titled "Toaru Majutsu no Index Gaiden: To Aru Kagaku no Mental Out" was launched in July 2021.