The Kamachi Kazuma "Toaru Majusu no Index" 10th Anniversary Animated Promotional Video is a special animated promotional video that was released on September 10, 2014 on Dengeki's Youtube channel, coinciding with the release of the first volume of Mitou Shoukan: //Blood Sign. It was released in celebration for Kamachi Kazuma's 10 year anniversary as a writer, and was the penultimate project release of the 10th Anniversary Projects. The video showcases the main cast of Kamachi's works as they gather for the 10th anniversary event. The video was animated by J.C. Staff, who animated the Toaru Majutsu no Index and Toaru Kagaku no Railgun anime series, and was accompanied by the song "Where I belong... Zutto", performed by Kawada Mami and composed by Iuchi Maiko, both of which contributed to th