A Certain Magical Index manga volume 15 features story by Kazuma Kamachi and art by Chuuya Kogino.

While Touma Kamijou's life is usually perpetual misfortune, he's suddenly presented with an unexpected stroke of luck: a couple's trip to the city of water, Venice! It's an exciting European trip for Touma and Index, but could this be the start of more bad times!?