Mikoto’s clones use their telepathic network to enlist Misaka 10032 to aid them in stopping Musujime from rebuilding the Tree Diagram in an effort to find out why humans are the only beings with esper powers.

It’s the Daihasei Festival, and everyone’s parents are in town! As Toma and Mikoto compete against each other in various events, a Roman Orthodox magician and her assistant negotiate to purchase a powerful relic from the English Puritan Church.

As Toma and his group try to track down Oriana, they discover that a “Shorthand”—a specialized spell that operates on its own once being cast—is shorting out their magic. But before they can deactivate it, an incident happens at the middle school.

With the Shorthand cancelled, Stiyl uses his magic to locate Oriana, causing a fight to erupt. In London, Laura learns that Oriana’s deal might not be for the Stab Sword, but for something else entirely.

Tsuchimikado’s location spell backfires and leads Oriana straight to him, resulting an epic showdown. But he’s not the only one exposed to Oriana’s magic: Himegami feels the force of the spell caster’s power, and may not survive.

Mikoto convinces Toma to sign up for a couples cell phone contract with her so she can get an adorable promotional item—but how far are the two willing to take the ruse before they get, well, maybe a little too close.

Laura is confronted with a confidential memo during her bath time, Toma buys Mikasa 10032 a piece of jewelry, and many old enemies come together in the search for Last Order.

Touma confronts Ars Magna in a dangerous battle to rescue both Index and Deep Blood.

Touma discovers the reason behind the experiment and appears to grow closer to Misaka.

Following the events of last episode and the activation of Index's defense mechanism Touma struggles to hide his amnesia from Index.

Touma encounters Ars Magna the leader of Misawa Cram School and a man with his own connection to Index.

Touma goes in search of Misaka to investigate the clone experiment.

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.

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.

Touma tries desperately to save Index's memories before it is too late.

Touma spends some time with Misaka Mikoto and makes a strange discovery.

With Orsola taken hostage, Toma and his gang take the battle to the church. There, Index unleashes a mighty spell. Things look bleak for the Roman Orthodox, but their willingness to sacrifice themselves might just give them the upper hand.

The Roman Orthodox nuns continue their attack as Orsola risks everything to have Index decipher the Book of Law. The infamous grimoire could help them finally defeat their enemies—but that’s only if it works like it's supposed to.

A high-tech suitcase is stolen from couriers, and Kuroko is on the job! But the contents of the package may prove to be more dangerous than any robbers or petty crooks. Also, what is up with all the strange weather in Academy City?

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.

While Komoe helps Index in healing her wounds using magic, Toma meets Stiyl's partner, Kaori Kanzaki and learns from her why they are hunting Index and the organization, Necessarius, The Church of Necessary Evil.

Touma learns the truth about Index's perfect memorization and her loss of memories.