August 31st (The Last Day).Tōma Kamijō is struggling to complete his summer homework at home, but Index is just being a distraction to him. While Tōma takes Index to a restaurant for a change of location, it becomes the worst day of his life, when they are attacked by a magician named Ōma Yamisaka, who kidnaps Index and runs off. As Tōma tries to find her, running into Mikoto Misaka along the way, Ōma prepares a ceremony that will allow him to access the grimoires inside Index's head in order to find a cure for a curse inflicted on a woman he has fallen in love with. As the ceremony begins, Ōma's body and mind is put through excruciating pain trying to access the grimoires. Thanks to Index discreetly using her new cellphone, Tōma is able to find her and stop the ceremony. Tōma gets Ōma to snap out his depression and offers to cure the woman's curse using his Imagine Breaker. Meanwhile, Motoharu Tsuchimikado witnesses Kaori Kanzaki fighting and defeating the Knights of England in Japan before parting ways.