The Last Day (August 31)
Series 3, Episode 1 M
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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, 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.
The Book of Law
Series 3, Episode 2 M
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Archbishop Laura Stuart informs Stiyl Magnus that The Book of the Law has been stolen and a skilled decoder named Orsola Aquinas has been kidnapped both by the Amakusa Catholics. She sends him, along with a group of Catholic battle nuns known as the Agnese Forces, to Japan to search for this grimoire as well as Orsola. In order to get Tōma's assistance, Stiyl pretends to kidnap Index. While Tōma coincidentally runs into Orsola on the way to save Index, the Amakusa Catholics appear and abduct her via a hole in the ground. After determining that the goal of the Amakusas Catholics is to use a special teleport magic to escape with Orsola before midnight, Tōma, Index, Stiyl and the Agnese Forces set up camp at the required location, where Tōma gets into a lot of awkward situations with the group's leader, Agnese Sanctis. Because Kaori was once an Amakusa Catholic, Stiyl knows he may have to fight her if necessary. Meanwhile, the Amakusa Catholics prepare to make their move.
The Amakusa Church
Series 3, Episode 3 M
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The Agnese Forces face off against the Amakusa Catholics as a diversion while Tōma, Stiyl and Index sneak inside an amusement park. While escaping from some of the Amakusa Catholics, Tōma manages to find Orsola and gives her a crucifix necklace that Styil gave him earlier. The two are reunited with Stiyl and Index, who are facing against the leader of the Amakusa Catholics, Saiji Tatemiya. Working together, Tōma and Stiyl defeat Saiji and the rest of the Amakusa Catholics are captured by The Agnese Forces. However, the captured Saiji reveals to Tōma and Index that the Amakusa Catholics have never stolen The Book of the Law, as the real reason the Catholic Church wanted Orsola was to kill her to prevent the secrets of the grimoire from being abused. The Amakusa Catholics only got involved as Orsola sought them for protection but ran away as she did not trust them. Troubled by this revelation, Tōma asks Lucia and Angelene, two of the Catholic battle nuns, to see Orsola again but he accidentally angers Lucia, who tries to kill him, Index and Saiji. However, she and Angelene are forced to retreat when Index uses spell interception on Angelene''s magic and counters Lucia''s attack.
Sheol Fear (Voice of the Magicbane)
Series 3, Episode 4 M
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Stiyl explains that the Amakusa Catholics will not kill Orsola until they can prove her to be a heretic. As Saiji leaves to free his comrades, Stiyl tells Tōma and Index to go home, since they have no further stake in this matter. Tōma, however, goes by himself to where Orsola is being held and tortured by Agnese, who reveals that her battle nuns deceived Necessarius to assist them. He is later joined by Stiyl, who reveals the crucifix necklace Tōma gave to Orsola means she is under protection of the Church of England, followed by Index and the Amakusa Catholics. While Tōma is put in charge in protecting Orsola, the others fend off the battle nuns, with Index utilizing Sheol Fear, the power to deafen and paralyze some of the battle nuns. However, Lucia brings another force of battle nuns, who willingly stab their ears to protect themselves from Sheol Fear.
Lotus Wand
Series 3, Episode 5 M
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As Tōma, Index, Stiyl, Saiji and Orsola barricade themselves from the battle nuns, Tōma and Index come up with an idea that Orsola could help them decipher The Book of the Law in Index's head to their advantage. When Orsola mentions her deciphering method, Index reveals her translations would be false, revealing Orsola was never able to really decode the grimoire all along. While the others fend off against the battle nuns, Tōma confronts Agnese, who attacks him with her Lotus Wand. However, Tōma manages to learn its attack patterns and lands a hit on Agnese. As Agnese tries to bluff that Tōma sacrificed his friends as decoys, they arrive with Innocentius, who Stiyl managed to summon thanks to the Amakusa Catholics. With her confidence broken, Agnese is knocked out by Tōma, breaking the battle nuns' morale, before Tōma himself falls unconscious. Waking up in the hospital in Academy City, Tōma is greeted and taken care by Kaori, who thanks him for helping and tells him that Orsola and the Amakusa Catholics are now under the protection of the Church of England. Meanwhile, back in London, Laura reveals to Stiyl that the true reason she got involved with the Orsola incident was to get the Amakusa Catholics under her control and use them as leverage to ensure Kaori's loyalty to Necessarius.
Remnant (Wreckage)
Series 3, Episode 6 M
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Kuroko Shirai goes out shopping with Mikoto, only to be interrupted her partner, Kazari Uiharu, who reports about robbers stealing an aerospace travel case. Kuroko subdues the thieves but is then attacked and wounded by their leader, another teleporter named Awaki Musujime. She reveals to Kuroko about Tree Diagram's destruction and how various factions are gathering of its remnants, the contents of the travel case being one of them. Kuroko manages to escape, but becomes concerned over what Awaki had told her, particularly concerning how Mikoto had been trying to stop them for reasons she had kept from her, namely being that if Tree Diagram were rebuilt, the Level 6 Shift experiment would start over again. As Mikoto goes out that night to confront Awaki, Kuroko decides to follow her and overhears their conversation before Awaki escapes. As Kuroko decides to take matters into her own hands, Misaka 10032 decides to take action.
Move Point (Coordinate Relocation)
Series 3, Episode 7 M
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Kuroko finds Awaki at a nearby building and uses the latter''s trauma of self-teleportion to make the first strike, but during their battle, Kuroko's injuries make her unable to concentrate on teleporting and she is trapped under a pile of furniture. Awaki explains to Kuroko that she and her organization, the Science Syndicate, plan to build a new Tree Diagram in order to create other species of espers. Believing that Kuroko wants to find the answer for having acquired her esper abilities, Awaki tries to persuade Kuroko to join her in the cause, but Kuroko rejects her offer, verbally abusing Awaki for making excuses for her own behavior. Kuroko breaks loose and tries to attack Awaki, only to be shot by her. After a brief traumatic loss of control over her powers, Awaki attempts to kill Kuroko by dropping the building on top of her, but she is saved by Mikoto and Tōma, who came to rescue her after he was alerted by Misaka 10032. As the Anti-Skills stop the Science Syndicate, Awaki tries to escape but is confronted by Accelerator, who uses the Misaka Network to utilize his powers in order to defeat her and destroy the Tree Diagram remnant. As everyone recovers, Mikoto gives her thanks to Kuroko.
The Daihaisei Festival
Series 3, Episode 8 M
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Academy City is hosting the Daihaisei Festival, a sports competition between the various schools of the city, during which visitors from outside the city are allowed entry. While Tōma's parents, Tōya Kamijō and Shiina Kamijō, as well as Misuzu Misaka, assumed to be Mikoto's older sister, get to know each other, Tōma and Mikoto decide to make a bet in which the loser does anything the winner wants. Meanwhile, Laura contacts Aleister Crowley to inform him that magicians have infiltrated Academy City in order to make a transaction with a magical weapon called the Stab Sword, which has the power to kill a Saint. Meanwhile, Tōma has several troubles with a hungry Index and awkward situations with the class representative, Seiri Fukiyose. Later, Tōma runs into Stiyl and Tsuchimikado, who tell him about the intruding magicians and asks him not to get Index involved. While getting scolded by Seiri after an awkward incident with Index and Komoe Tsukuyomi, Tōma runs into a woman named Oriana Thomson. When his Imagine Breaker reacts to her, he realizes she is one of the magicians in question and starts to follow her.
Route Disturb (Pursuit Inhibited)
Series 3, Episode 9 M
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Tōma, Stiyl and Tsuchimikado chase Oriana through a bus station filled with booby traps, but she manages to escape and uses a counter magic called Shorthand to avoid being traced. Despite Tōma''s objections, Stiyl and Tsuchimikado undergo a painful magical spell in order to locate Shorthand, which happens to be right in the center of a middle school ball toss competition. With the competitors in danger of being hurt by the spell if they touch it, Tōma and Tsuchimikado infiltrate the match as contestants in order to find it, only to find the opposing team is Mikoto's school. Tōma tries to protect Mikoto from one of the basket poles which he believes has Shorthand, only for Seiri to end up touching the real one, getting hit by magic and falling unconscious before Tōma destroys the spell. As Seiri is taken to the hospital, Tōma vows to make Oriana pay for what she did.
Shorthand (Stenographic Sourcebook)
Series 3, Episode 10 M
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While Heaven Canceler attends to Seiri, Stiyl manages to lead Tōma and Tsuchimikado to Oriana''s location. Oriana inflicts a curse on Tsuchimikado and gives Tōma trouble with her variety of spells, yet Tōma's determination allows him to land a hit on her. Oriana escapes but leaves behind her cargo, which is later revealed to be a decoy. Laura soon learns that the Stab Sword is actually the Croce di Pietro, an artifact which she fears the Catholic Church will use to put Academy City under their control if the trade goes through. After Tōma, Stiyl and Tsuchimikado are informed of this, Tōma has lunch with Index, his parents, Mikoto and Misuzu, and is surprised to learn Misuzu is actually Mikoto''s mother.
Stab Sword
Series 3, Episode 11 M
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After Tōma has some women trouble with Index, Mikoto and Kuroko following lunch, Tsuchimikado manages to find Oriana's location and instructs him and Stiyl to go there. However, while Tsuchikimado tries to track Oriana, she goes straight to him and attacks him. She defeats Tsuchikimado and destroys his search spell, but he manages to bluff that he has summoned reinforcements to trick her into running away before she finishes him off. Meanwhile, Aisa Himegami becomes worried about Tōma, with Komoe suggesting she should invite him to a night parade at the end of the festival. However, when they bump into Oriana as she makes her escape, she sees Aisa's magic Celtic Cross and mistakes her for a Necessarius magician, attacking her with a vicious spell which leaves her brutally wounded. As Tōma falls into despair upon witnessing her state, Komoe recalls the healing spell she performed on Index, so Stiyl stays to help her perform it while Tōma chases after Oriana.
Belvedere (The Observatory)
Series 3, Episode 12 M
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After losing track of Oriana, it is then that Tōma and Tsuchikimado realize Oriana is actually scouting the city to find the perfect location to use the Croce di Pietro. Thanks to the information provided by Orsola, they learn the Croce di Pietro can only be activated in a large open area where the constellations can be seen at sundown. Tsuchikimado figures out that the Academy City airport located at School District 23 is the perfect area to activate the cross, so he, Tōma and Stiyl head there quickly as sundown is approaching. By the time they have arrived, Lidvia Lorenzetti, the Catholic nun that Oriana is working with, has brought the Croce di Pietro and starts activating its magic while Oriana defends her from the trio, defeating both Tsuchikimado and Stiyl, with Tōma the only one left standing.