A Certain Magical Index: Season 1

Tōma Kamijō, a Level 0 student living in Academy City, has a unique ability capable of nullifying psychic, magical, and divine powers, yet also negating his good luck. He survives a reluctant duel against Mikoto Misaka, a powerful Level 5 esper capable of controlling and generating electricity, resulting in her causing a citywide blackout. The following morning, Tōma finds a young nun from the Church of England hanging off his balcony. She introduces herself as Index and reveals being chased by

The magician introduces himself as Stiyl Magnus and explains that his partner named Kaori Kanzaki unintentionally hurt Index, believing that the latter's habit would protect her from attacks. He explains to Tōma his mission to retrieve Index due to her photographic memory of 103,000 grimoires of the Index Librorum Prohibitorum. An enraged Tōma attacks Stiyl but the latter responds by using fire magic. The magician is surprised to see him nullifying his spell attack, causing him to summon a fire

Komoe successfully assists Index in her ancient magic ritual to heal her wounds and questions Tōma about her relationship with him the following morning. After his teacher left them in her apartment, Tōma learns from Index about the organization she belonged to called "Necessarius" and how they implanted the grimoires into her mind to make her a living library for the Church since reading the original magical texts will curse and taint people. Meanwhile, Stiyl and Kaori continue to observe Index

Tōma refuses to hand Index over to Kaori, who revealed about being a member of Necessarius and her friend. Kaori tells him her intention to not hurt Index when she attempted to secure her the day before since she is unaware of how her habit rendered useless against her attack. She then explains Index's brain contains eighty-five percent of the entire Index Librorum Prohibitorum and the remaining fifteen percent needs to be annually erased to avoid any strain with any unnecessary memories, giving

Stiyl and Kaori tell Tōma the spell to erase Index's memories will be performed at exactly midnight. Tōma attempts to find another way to save Index but he becomes helpless as the magicians arrive to prepare the spell. Alone with Index to say his farewell, Tōma suddenly becomes suspicious of Kaori's statement about her brain capacity. During a phone call with Komoe, he learns about the humans' incapability to suffer or die from being overloaded with information, and realizes how the Church erase

Tōma makes Stiyl and Kaori realize how Necessarius lied to them about Index's condition and the rune responsible for her pain needs to be destroyed to allow her to live a normal life. With the magicians' help, he manages to deactivate St. George's Sanctuary, saving Index in the process, but he is rendered unconscious when a feather from the spell touched his head. At the hospital, Index learns that Necessarius decided to leave her alone for now since Stiyl and Kaori are currently questioning the

Tōma continues to keep his memory loss a secret and inadvertently upsets Index when he met with his two friends named Motoharu Tsuchimikado and Aogami Pierce, who both inadvertently insulted her. They went to a fast-food restaurant and Index goes into an argument with a girl dressed in miko, who introduced herself as a magician. The girl leaves before Index can learn about the magical organization she belonged to. On the way home, Index finds an abandoned cat and names it as Sphinx. She then cha

Stiyl explains the dead knight is from the Thirteen Knights of the Roman Catholic Church and a magical barrier is concealing all magical occurrences inside Misawa Cram School from the public. He and Tōma are forced to separate when mind-controlled students cast an imitation of the Gregorian choir spell against them. Stiyl later finds Aureolus, while Tōma runs into Aisa, who revealed that she approached Aureolus because he has agreed to help her in curing her power that had caused people to turn

Tōma and Stiyl find Aureolus at his office, along with Aisa and an unconscious Index. It is revealed that Aureolus was Index's partner three years ago and became devastated about the need to erase her memories annually. He intends to use Ars Magna, along with Aisa's power, to turn Index into a vampire to overcome her one-year life expectancy. However, Aureolus becomes distraught when he learned Tōma already saved Index by using his ability, causing him to use his power against Tōma, Stiyl, and A

A girl resembling Mikoto and wearing military goggles uses a sniper rifle to shoot a teenager named Accelerator, only for the shots to be reflected and her to wind up face-to-face against him. Tōma runs into Mikoto at a vending machine and they are caught off guard by her kōhai named Kuroko Shirai. After Kuroko teleported away, the two encounter another girl that looked exactly like Mikoto, who identified herself as her younger sister and referred to herself as Misaka. A frustrated Mikoto leads

Accelerator kills Misaka using his ability to manipulate vectors. Tōma finds her dead body in the dark alley and calls the city's police force called "Anti-Skill", but they find the body missing. A confused Tōma continues to search the alley and becomes relieved to find Misaka alive but horrified to see her carrying a body bag that contained the corpse he had seen earlier. Dozens of identical girls show up and reveal to be clones of Mikoto, calling themselves "Sisters", with the one who carried

Komoe demonstrates to Index and Aisa the extrasensory perception based on Schrödinger's theory. In the past, Mikoto had attracted a group of doctors who mentioned her ability may help people with muscular dystrophy, only to learn later about her DNA being used to create clones for military use, and was horrified to witness how her Sisters were used to fight Accelerator. Tōma confronts Mikoto about the experiment in which 20,000 clones of her would be used to fight against Accelerator in specific

Misaka #10032 arrives at a goods station, where she began to prepare for the upcoming battle against Accelerator, and wonders why she thought of Tōma during this time. At a bathhouse, Komoe continues explaining to Index and Aisa how espers acquired their powers by separating them from proper reality and making their reality and about Academy City's purpose to facilitate this process, though Level 0s like Tōma indicate the process has not yet been perfected. Tōma regains consciousness and tells M

Tōma survives the explosion and is found by Accelerator, who became impressed by managing to bring him so close to death. He lands a hit on Accelerator and realizes his Imagine Breaker can nullify the latter's ability, making him physically beat him up with his right hand. Accelerator breaks away and begins to manipulate the air to launch projectiles at Tōma, who got saved by the arrival of Mikoto. However, Mikoto realizes Accelerator is creating a plasma attack by controlling the direction of t

Komoe sends Tōma, with Index tagging along, off to a beach resort until things calm down in Academy City. Tōma is relieved to see his father named Tōya Kamijō but finds his cousin named Otohime Tatsugami and his mother named Shīna Kamijō resembling Mikoto and Index, respectively. Moreover, Tōma becomes confused to see the townspeople have changed to familiar faces, yet he seems to be the only one who noticed the difference. He later encounters a strange blonde girl and gets threatened by her wit

Kaori, Motoharu, and Misha, all suggesting that the spell caster must be someone close to Tōma, join him at the beach resort at night to investigate the source of the spell. Motoharu reveals being an onmyōji before becoming an esper. He and Kaori cast a spell earlier against Angel Fall but they remain affected, appearing to others as a famous pop singer named Hajime Hitotsui and Stiyl respectively. Kaori mentions being a priestess of the Amakusa Church, a Japanese Catholic organization, before l

It turns out Tōya knows nothing about Angel Fall. Misha shows up and reveals herself to be Archangel Gabriel, the fallen angel from Heaven who took the appearance of Sasha Kreutzev, and plans to kill Tōma to grant her return. While Kaori holds the archangel off, Motoharu tells Tōma and Tōya about their residence to be the ritual site since the latter arranged occult souvenirs around the house in feng shui. He plans to destroy Tōya due to the fact of him being the cause of Angel Fall's casting. T

Mikoto is being stalked by Mitsuki Unabara, the Tokiwadai Middle School principal's grandson, since the last week of summer vacation. She sees Tōma and his friends passing by her dormitory and decides to pretend to go on a date with him. After an embarrassing mix-up with hotdog sandwiches, Tōma learns from Mikoto that less than ten of the Sisters remained in Academy City. Mikoto later goes to a restaurant, while Tōma encounters Mitsuki. Tōma then sees an identical Mitsuki entering the restaurant

Since his defeat, Accelerator is no longer feared by others, though he remains powerful enough to get rid of troublemakers. During the last day of summer vacation, he is approached by a younger Misaka clone capable of showing emotions, who introduced herself as Last Order, and is being followed by her as he returns to his apartment, much to his annoyance. Accelerator later takes a hungry Last Order to a restaurant and sees Ao Amai, a former researcher of the Sisters Project, but does not pursue

Accelerator returns to the diner and learns about Last Order being kidnapped by Ao. He manages to track him down and knocks him out before he can escape with her. However, the virus in Last Order activates earlier than expected and Kikyō is still en route with her incubator. Accelerator uses his ability, along with the clean copy of Last Order's data, to remove the virus. Near the end of the process, Ao regains consciousness and shoots Accelerator in the head. Accelerator is unable to fully stop

After the summer break, Tōma returns to school and learns Komoe is researching about AIM (An Involuntary Movement), a diffusion field of power that espers emit. Index is sent away by Komoe when she arrived at Tōma's class and Aisa introduces herself as the new transfer student. She runs into another transfer student named Hyōka Kazakiri and befriends her. Tōma later finds them, but Komoe catches him skipping the opening ceremony and they later notice Hyōka's sudden disappearance. Aisa becomes su

Sherry begins her assault on Academy City to start a war between them and Necessarius. As a result, Tōma, Index, and Hyōka are trapped in the underground mall before they can be evacuated with other civilians. Mikoto and Kuroko find them, with the latter teleporting Index and Mikoto away to safety. Tōma confronts Sherry, who recently defeated the Anti-Skill led by one of his school teachers named Aiho Yomikawa, and leaves Hyōka to wait for Kuroko to return. Hyōka shows up as Tōma tries to fight

Tōma successfully destroys Sherry's golem with Imagine Breaker. As Sherry summons another one, he coordinates with Anti-Skills to put her on the defensive. However, when Sherry suddenly decided to flee, Tōma realizes her target is not Hyōka specifically but anyone valuable enough to trigger a war between Necessarius and Academy City, indicating Index is Sherry's next target. Hyōka, acknowledging how she came into being, chooses to save Index and escapes the underground mall without Tōma. Meanwhi

Tōma goes after Hyōka but encounters Sherry instead. He learns from her about her friend, also named Ellis, who was an esper involved in an experiment between Necessarius and Academy City twenty years ago to create the first esper-magician hybrid, but she suffered from the experiment and was killed by the Knights. Sherry intends to divide both sides forever to prevent this tragedy from occurring again. Tōma becomes outraged at Sherry for not believing how different people like Index and Hyōka co