Maon Kurosaki's new single is the intro theme to "To Aru Majutsu no Index 3". Mami Kawata continues to work on the lyrics for this release along with composer Tomoyuki Nakazawa who has contributed many tracks for the series together with Kawata. Limited Anime Edition comes with a creditless intro of TV anime "To Aru Majutsu no Index 3" and a music video of "Gravitation" in a short ver.