Mami Kawada is a former Japanese pop singer and lyricist who was signed to NBCUniversal Entertainment Japan and also a member of I've Sound, a musical group which produces soundtracks for eroge and anime.

A Certain Magical Index is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura, which has been published by ASCII Media Works under their Dengeki Bunko imprint since April 2004 in a total of three separate series. The first ran from April 2004 to October 2010, the second from March 2011 to July 2019, and the third from February 2020 to present.