Panic envelops Academy City upon the arrival of the sorcerer Sherry Cromwell, who makes no secret of her scheme to destroy Kazakiri. Kamijo scrambles to thwart Sherry's plot, but the situation is much more complex than it appears.
School is back in session and Index arrives as a new transfer student. In class, Komoe shares insight into the realities of life as an esper. Also: A powerful new magical presence is detected in Academy City.
Accelerator frees Last Order from the virus infecting her brain, after which he faces the gun-wielding Amai. Just as all appears lost for Accelerator, Yoshikawa arrives to help, but Amai won't go down without a fight.
Kamijo poses as Misaka's boyfriend in order to ward off the unwanted attention she's getting from Unabara. Yet it gets complicated for the fake couple when it's discovered that Unabara is hiding a magical secret.
The truth about Misha's real identity is uncovered, after which Kamijo and Toya are sent to destroy the ritual spot. Later, Tsuchimikado suggests that Toya must die for the spell to end, leading to a violent and possibly fatal encounter.
Kamijo and Tsuchimikado confront Misha about her suspicious behavior. Then, they come to suspect that Toya might have something to do with the Angel Fall spell. Also: Kamijo tries to save his father from the Russian sorcerer's wrath.
Kamijo meets his family at a beachside resort, then has a showdown with a Russian sorcerer named Misha. Later, Kanzaki and Tsuchimikado address the ramifications of a recently cast spell called Angel Fall.
Kamijo battles Accelerator, hoping to give Mikoto and her clones a better life. In the wake of the showdown, Misaka 10032 and Kamijo discuss the steps that must be taken for the clones to adapt to life in Academy City.
Kamijo discovers that thousands of Mikoto clones were created for one simple, violent reason. As her look-alikes begin to die off, the real Mikoto plans to make the ultimate sacrifice in a bid to save her remaining duplicates.
Kamijo and Stiyl infiltrate Misawa Prep School, only to quickly fall under attack. During the raid, Kamijo chances upon the girl they hoped to rescue, yet there's a chance she isn't interested in leaving the campus.
The adventures kick off when a student named Kamijo meets Index as she flees from a magic society that wants forbidden knowledge stored in her memory. Later, a shocked Kamijo finds Index at his house, bleeding and accompanied by a strange man.