Book-On is a bookshop that can be found in Academy City that is based on the Japanese bookshop, Book-Off. The establishment is fairly spacious and contains a variety of books for sale, as well as CDs and DVDs; the store lies across the road in front a dark alleyway, this is where Touma discovers the remains of Misaka 10031 during the Sisters Arc. The bookshop only appears in the anime in both adaptations.