is the ninth single released by the J-pop singer Mami Kawada.

The title track is used as the first opening theme for the second season of the anime series A Certain Magical Index.

According to Kawada, the song is based on the image of Kamijou Touma, the main character in the "Toaru Majutsu no Index" series.

was first performed at the "Dengeki GENEON Music Fest" talk, live, and screening event held at JCB HALL on September 26, 2010, and was first aired on "A&G Super Radio Show - Anispa!

This is the eighth time that Mami Kawada has tied up with an anime work written by Dengeki Bunko and produced by J.C. STAFF, following her previous song "Prophecy".