"A Certain Magical Index" is a popular Japanese light novel series penned by Kazuma Kamachi. It has been published in three separate series since 2004 by ASCII Media Works under their Dengeki Bunko imprint. Set in a world where supernatural abilities exist, the series' narrative focuses on Toma Kamijo, a high school student with the unique ability to nullify the powers of others. Despite facing initial rejection, Kamachi's work has found both critical and commercial success, praised for its innovative exploration of magic and science, as well as its well-developed characters. The series has also been adapted into various formats including manga, anime, a film, and even video games.