Kamijo meets Index, who is on the run from a magic society that wants the library of forbidden knowledge stored in her memory. Later, Kamijo is shocked to find Index at his house - bleeding and accompanied by a strange man.

Kamijo tangles with Stiyl, upset with the magician's rough behavior toward Index. When quick thinking allows Kamijo and Index to escape, they head to the one person that might be able to help them.

Kamijo learns more about Index's history with Necessarius, the Church of Necessary Evil. Later, after a trip to the bathhouse leads to an argument with Index, Kamijo finds himself in the company of a mysterious stranger.

Kaori Kanzaki confronts Kamijo, demanding that he hand over Index. Kamijo is wounded in the ensuing scuffle - and when he wakes up a few days later, Index offers to take drastic measures to protect him from further harm.

When Kamijo springs into action to prevent Kanzaki and Stiyl from erasing Index's memory, he learns there's a chance that the Church was lying about the threat to Index's life all along!

Kamijo succeeds in eliminating the magical threat to Index's life. Unfortunately, his memory is erased in the process! Later, Stiyl's boss orders him to work with Kamijo. Their assignment: Find Deep Blood.

Stiyl tells Kamijo (who has no memory of the sorcerer) about his plan to raid Misawa Prep School in order to rescue a young girl who wields a vampire-summoning power known as Deep Blood.

Kamijo and Stiyl quickly fall under attack after infiltrating Misawa Prep School! During the raid, Kamijo runs into the girl they hoped to rescue - but there's a chance she isn't interested in leaving the campus!

Aureolus finds his plan to turn Index into a vampire thwarted and learns that Kamijo has already saved Index's memory. Overwhelmed by anger and jealousy, the alchemist attacks Kamijo in a fit of murderous rage.

Kamijo senses something odd about the relationship shared by Mikoto and Misaka, who appears to be Mikoto's twin. Later, after a friendly meeting with Kamijo, Misaka has a much more intense encounter with Accelerator.

Kamijo is surprised - and confused - by the sudden arrival of yet another Misaka doppelganger. When the new look-alike explains why there are so many Mikotos running around, Kamijo decides to investigate.

Kamijo learns that thousands of Mikoto clones were created for one simple, violent reason. Now that her look-alikes are dying off, the real Mikoto vows to save the rest of her doppelgangers by making the ultimate sacrifice.

During a trip the bathhouse, Komoe offers insight on the awakening of esper powers to Index and Himegami. Later, Mikoto is skeptical when Kamijo volunteers to take on Accelerator in battle.

Kamijo fights Accelerator to gain a better life for Mikoto and her clones. When the battle ends, Misaka 10032 visits Kamijo in the hospital to discuss the steps that must be taken for the clones to adapt to life in Academy City.

After Kamijo travels to a beach-side resort to meet his family, he winds up tangling with a Russian sorcerer named Misha. Later, Kanzaki and Tsuchimikado explain the ramifications of a recently cast spell called Angel Fall.

After Kamijo and Tsuchimikado rush to confront Misha about her suspicious behavior, they realize that Toya might have something to do with the Angel Fall spell. Can Kamijo save his dad from the Russian sorcerer's wrath?

After figuring out the truth of Misha's real identity, Kanzaki sends Kamijo and Toya to destroy the ritual spot. When Tsuchimikado suggests that Toya must die for the spell to end, a violent - and seemingly fatal - encounter ensues.

In order to shake off the unwanted attention she's getting from Unabara, Misaka asks Kamijo to pretend to be her boyfriend. Things get complicated when the faux-couple discovers that Unabara is hiding a magical secret.

As summer ends, Toma desperately tries to catch up on homework--but that's totally out of the question once a magician named Yamisaka kidnaps Index. As Toma tries to rescue his friend, he finds there may be more to her captor's motives than just malice.

After Accelerator frees Last Order of the virus infecting her brain, he's attacked by gun-wielding Amai. Just as all appears lost for Accelerator, Yoshikawa arrives to help - but Amai isn't going down without a fight.

School's back in session and that means new transfer students - one of which is Index! In class, Komoe offers more insight into the realities of life as an esper - and a powerful new magical presence is detected in Academy City.

Panic ensues in Academy City upon the arrival of the sorcerer Sherry Cromwell, who makes no secret of her plans to destroy Kazakiri! Kamijo steps up to ruin Sherry's plot - but the situation is more complex than he knows.

Kamijo chases Sherry away only to discover the sorcerer now has designs on Index! Meanwhile, with her secret revealed, Kazakiri takes advantage of her new situation and sets out to fight Ellis.

Kamijo, Index and Kazakiri join forces to take on Ellis. When the battle ends, and with the support of Index, Kazakiri returns to the place of her origin. Later, Tsuchimikado ponders Aleister's role in recent events.