Story Arcs

This is a list of Story Arcs and their corresponding summaries, for the Toaru Majutsu no Index main storyline, Toaru Kagaku no Railgun side story, Toaru Kagaku no Accelerator side story, Astral Buddy side story, and Toaru Kagaku no Dark Matter side story. This summary does not include the story timeline.
The list also includes the number of light novel volumes, manga chapters, anime episodes and specials the story arc has.
==Toaru Majutsu no Index==
===Academy City Arc===
Academy City is the head of the Science Side, a city in Tokyo, mostly populated by students; Espers ranging in power Level from 0 to 5. Kamijou Touma is a Level 0 who will fight to protect those in danger in spite of his extremely bad luck. He possesses Imagine Breaker; a power residing in his right hand which negates all supernatural phenomena, whether Magical or Scientific in nature. One day he finds a girl named Index Librorum Prohibitorum on his balcony. She claims to be a Magician with Perfect Memory, who has memorized 103,000 Grimoires. He immediately gets a desire to defend her from her apparent pursuers.
With Index now living under his roof and his memory lost due to the incident that brought them together, Touma is now entangled in Magic Side affairs along with the Science Side troubles he's surrounded by. Incidents on both sides occur and Touma seems to always find himself caught in the middle, having to protect others.
These incidents effect the lives of many and build a group around him of those most directly effected, changing their lives forever. Unfortunately, they also grant him and Academy City many dangerous and powerful enemies. All while the city itself, seems to be laying the groundwork for something big that could effect the entire world.
====Index Arc====
The Index Arc is the first major story arc introduced in the Toaru Majutsu no Index series. The arc introduces Kamijou Touma, a young man with the mysterious power of the Imagine Breaker, who meets a mysterious nun by the name of Index which pulls him into the mysterious world of magic. This arc occurs near the end of the Level Upper Arc in the Toaru Kagaku no Railgun sidestory.
*Light Novels: 
*Manga Chapters: , , , , , , , , , 
*Anime Episodes: , , , , , 
====Deep Blood Arc====
The Deep Blood Arc is a story arc that occurs in the Toaru Majutsu no Index storyline. It introduces Himegami Aisa and her ability "Deep Blood", which is central to the plans of Aureolus Izzard, a powerful alchemist and former partner of Index.
*Light Novels: 
*Manga Chapters: Not included in the Manga
*Anime Episodes: , , 
====Sisters Arc====
The Sisters Arc is a major story arc in the Toaru Majutsu no Index universe. Originally only lasting a single volume in the light novels, it is later expanded greatly in the Toaru Kagaku no Railgun manga. It is also the first story arc to be focused on the Science Side.
The arc focuses on the ordeals of Misaka Mikoto after discovering the existence of Misaka clones that are being used in the Level 6 Shift, an experiment where they are killed as so Accelerator, the number one Level 5 esper, can achieve Level 6. When Touma happens upon the experiments and learns of Mikoto's despair, it sets off a chains of events that will pit the weakest and strongest espers of Academy City against each other.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , 
*Anime Episodes: , , , , 
====Angel Fall Arc====
Angel Fall Arc is a story arc that occurs in the Toaru Majutsu no Index storyline. It concerns with the activation of a world-wide spell known as Angel Fall, a spell that switches the elements, as well as the appearances of persons around the world. The most notable affect of Angel Fall is the expulsion of an angel to earth. Touma, on a forced vacation with his family, is roped into hunting the spell's caster alongside his friend Tsuchimikado Motoharu and Necessarius agent Kanzaki Kaori.
*Light Novels: 
*Manga Chapters: Not included in the Manga
*Anime Episodes: , , 
====Three Stories Arc====
The Three Stories Arc is a story arc that occurs in the Toaru Majutsu no Index storyline. The arc focuses on three separate events that happen on August 31; two stories focus on Touma dealing with magicians while the other focuses on Accelerator dealing with the aftermath of the Level 6 Shift, which would mark the first time Accelerator is featured as a protagonist to the science side.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , , 
*Anime Episodes: , , , 
====Kazakiri Hyouka Arc====
The Kazakiri Hyouka Arc is a story arc in the Toaru Majutsu no Index storyline. In this arc, Index befriends Kazakiri Hyouka, a physical manifestation of all espers AIM diffusion fields in Academy City and the key of the Imaginary Number District. However the two of them become targets of a magician seeking to ignite a war between the Magic and Science sides.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , 
*Anime Episodes: , , , 
====Orsola Aquinas Rescue Arc====
The Orsola Aquinas Rescue Arc is a major story arc in the Toaru Majutsu no Index storyline. It focuses on the rescue of the title character of the arc, Orsola Aquinas, a member of the Roman Catholic Church who has found a way to decipher the mysterious Book of the Law, a grimoire that is said to hold great power.
The arc marks the first time Touma battles against the Roman Catholic Church, as well as the first time that two different Christian sects – Anglican Church (specifically Necessarius) and the Roman Catholic Church (specifically Agnese Forces) – come into conflict.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , , , 
*Anime Episodes: , , , 
====Tree Diagram Remnant Arc====
The Tree Diagram Remnant Arc is a story arc in Toaru Majutsu no Index. Focusing mostly on the point-of-view of Judgment member Shirai Kuroko, it deals with an important piece of the recently destroyed Tree Diagram, the Remnant, being stolen by Musujime Awaki, a fellow teleporter, as well as Misaka Mikoto and her clones' struggle to stop the experiment from happening once again.
*Light Novels: 
*Manga Chapters: , , , , , , , , 
*Anime Episodes: , 
====Daihasei Festival Arc (Index)====
The Daihasei Festival Arc is a story arc in Toaru Majutsu no Index. It is September 19th, and the time has come for Academy City's annual Daihasei Festival, a sporting event that pits ability users from across the various schools of the city against one another in a series of contests. For Kamijou Touma, this year's festivities have come with a twist as he finds himself having to foil a plot that could wreck the fragile balance between the worlds of science and magic.
*Light Novels: and 
*Manga Chapters: , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , 
===Versus Roman Catholic Church Arc===
After a few incidents that have led to their embarrassment, the Roman Catholic Church now plans to destroy Academy City, a major cog in their past embarrassments. Their secret organization; God's Right Seat, stand as a threat to the head of the Science Side and has the Russian Orthodox Church on their side. As the conflict escalates, war becomes imminent between Science and Magic.
Each member of God's Right Seat has their own motivations, but the end goal is the same, Academy City's destruction. However, the group's leader, Fiamma of the Right, has a goal that can throw the laws of the entire world into chaos and the war is just merely the beginning.
As all of this unfolds, chaos erupts in the underworld of the city as the many factions of Academy City's Dark Side begin to move in reaction to the recent events.
The building chaos engulfs Touma's life, making him the target of God's Right Seat and revealing his memory loss to his allies. The only way for him to escape the conflict is to defeat God's Right Seat and make peace with one of the most powerful religious organizations in the world. Which isn't as easy as it sounds.
====La Regina del Mare Adriatico Arc====
La Regina del Mare Adriatico Arc or The Queen of the Adriatic Sea Arc is a story arc in Toaru Majutsu no Index. The arc is concerned with Kamijou Touma mysteriously winning a trip to Northern Italy despite his misfortune. Here, he is suddenly caught in another conspiracy by the Roman Catholic Church, this time regarding the mobilization of an ancient weapon against Venice – The Queen of the Adriatic Sea.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , 
*Anime Episodes: , , 
====Academy City Invasion Arc====
The Academy City Invasion Arc is a major story arc in Toaru Majutsu no Index. It features a series of interrelated events occurring in Academy City during Vento of the Front's attempt to search and kill Kamijou Touma, who has now become an enemy of God and the Roman Catholic Church; and Accelerator's struggle to protect Last Order, as he fights against his former mentor Kihara Amata.
In-universe it is called the 0930 Incident, an event that would influence several other events and story arcs to come later in the series, and would be the primary trigger for the final arc of the Toaru Majutsu no Index series before New Testament. This is most notably due to the now apparent hostility between the two sides after the events of the arc as well as the acknowledgment of the existence of "magic", and the ever increasing presence of Kamijou Touma and his Imagine Breaker in magic side affairs.
*Light Novels: and 
*Manga Chapters: , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , 
====Skill-Out Uprising====
The Skill-Out Uprising are a series of events carried out by Komaba Ritoku's Skill-Out gang, and would have culminated in Skill-Out's disabling Academy City's communication network allowing them to attack target espers.
The plan fails after the death of Komaba Ritoku and the turning over of power of his gang to Hamazura Shiage. However, the entire purpose of the plan was later carried out by Accelerator after Ritoku's death.
*Light Novels: 
*Manga Chapters: , , , , , 
*Anime Episodes: , 
====Document of Constantine Arc====
The Document of Constantine Arc is a major story arc of the Toaru Majutsu no Index series. The arc concerns with Kamijou Touma being sent to Avignon, France, in order to negate the power of the titular artifact, which is being used by the Roman Catholic Church to turn the world against Academy City. However, in order to get to the artifact, he must face Terra of the Left of God's Right Seat.
*Light Novels: 
*Manga Chapters: , , , , , , , , , 
*Anime Episodes: , , 
====Battle Royale Arc====
The Battle Royale Arc is a major story arc of the Toaru Majutsu no Index series. It is the first arc known not to even feature a physical appearance of Kamijou Touma, and instead focuses on Accelerator and introduces Hamazura Shiage from the first side story volume as a major protagonist. The arc deals with the conflicts of the underground organizations of Academy City and the Level 5 espers among them, revealing number 2 Kakine Teitoku of , who wishes to displace Accelerator as the strongest, and the number 4 Mugino Shizuri of , who sees Kakine as her major rival.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , , , , , , , 
*Anime Episodes: , , 
====Acqua of the Back Arc====
The Acqua of the Back Arc is a major story arc of the Toaru Majutsu no Index series. Following the defeats of Vento of the Front and Terra of the Left, Acqua of the Back sends a warning to Academy City and the Church of England that he intents to eliminate Kamijou Touma. In response, the Amakusa-Style Remix of Church comes to Touma's aid, but they find themselves struggling against a man who is not only a member of God's Right Seat, but a Saint as well.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , , , , , 
*Anime Episodes: , , 
====British Royal Family Arc====
The British Royal Family Arc is a major story arc of the Toaru Majutsu no Index series. The arc focuses on a magical conflict in the United Kingdom, as Second Princess Carissa launches a coup d'état for the throne with the backing of the Knights of England. She is opposed by her younger sister Villian, who has the aid of Necessarius, including Index and Kamijou Touma, the two originally in England to investigate a magical attack on the Eurotunnel.
The end of this arc, as well as the following one, would immediately segue into the final arc of the Toaru Majutsu no Index light novels. In this arc, the end of the civil war is marked with Kamijou's first confrontation with Fiamma of the Right, who had taken advantage of the chaos to steal a relic that controls Index and grants him access to the grimoires in her memory. This is followed by Kamijou leaving Index in the care of Necessarius as he chases after Fiamma into Russia, alone.
*Light Novels: and 
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , 
====DRAGON Arc====
The DRAGON Arc or the DRAGON(≠Angel) Arc is a major story arc of the Toaru Majutsu no Index series. The arc occurs in parallel to the previous arc, focusing on the happenings in Academy City's dark side. It continues on from the aftermath of the Battle Royale Arc, as Accelerator and try to track down the mysterious organization known as DRAGON, while Hamazura Shiage finds himself dodging assassins, ultimately finding himself in another confrontation with Mugino Shizuri, who he had previously defeated.
The end of this arc, as well as the previous one, would immediately segue into the final arc of the Toaru Majutsu no Index light novels. In this arc, Last Order falls ill after the manifestation of Aiwass, the latter later pointing Accelerator towards Russia if he wishes to cure Last Order, while Hamazura rescues Takitsubo Rikou and hijacks a plane that is programmed to go to Russia already.
*Light Novels: 
*Manga Chapters: , , , , 
*Anime Episodes: , , 
====World War III Arc====
The World War III Arc is a major story arc of the Toaru Majutsu no Index series. Notably it marks the end of the original Toaru Majutsu no Index light novels. The arc focuses on the three protagonists, Kamijou Touma, Accelerator, and Hamazura Shiage, heading deep into Russia in order to save the one they hold dear just as the entire world plunges into a Third World War. In order to save Index, Kamijou is hunting down the leader of God's Right Seat, Fiamma of the Right, the man who stole the spiritual device that controls Index and has now sparked a global conflict in order to fulfill his ambitions. On the advice of Aiwass, Accelerator is searching for anything involving a "different set of supernatural laws" in order to heal Last Order. Meanwhile, Hamazura is searching for a place that can cure Takitsubo Rikou of Body Crystal poisoning, as well as finding materials to blackmail Academy City with.
*Light Novels: , and 
*Manga Chapters: N/A
*Anime Episodes: , , , , , , , , 
==Shinyaku Toaru Majutsu no Index==
=== Arc===
World War III has concluded and the Dark Side of Academy City has been disbanded. As everyone attempts to return to their normal lives, a new threat has formed in response to the Magic Side's defeat at the hands of the Science Side. , a group of Norse Magicians is plotting to go to war against Academy City. The cabal's leader; Othinus wants to return to her former stance as a Magic God and is trying to construct a spiritual item known as Gungnir. As the group goes around the world to construct the mythical spear, they create utter chaos and spread worldwide fear.
Meanwhile, Kamijou Touma has returned. Unfortunately, his luck hasn't gotten any better as he is immediately thrown into battles with , who want to kill him and destroy his Imagine Breaker, by Leivinia Birdway; boss of the Dawn Colored Sunlight.
The world is in chaos, but this chaos has brought many forces together. As the Anti- Alliance attempt to resolve the chaos, Gungnir is nearing closer and closer to completion. Touma is in a situation that changes who he is at his core and a threat that could destroy the world is about to rear its ugly head.
Meanwhile, Academy City's dark side still exists and the appearance of has kick started a new project known as the Agitate Halation Project, centering on Fremea Seivelun; Frenda's sister, and all of Academy City's "heroes" can't help but protect her.
====Freshmen Arc====
The Freshmen Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. Notably it marks the beginning of the Shinyaku Toaru Majutsu no Index light novels. Here, Accelerator and Hamazura Shiage try to return to normal lives after fighting in World War III, only to be drawn back into the darkness of Academy City with the appearance of Kuroyoru Umidori and the Freshmen. Like the DRAGON arc, Kamijou Touma only appears at the end, revealing his fate after his "death" in the World War III arc.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Homecoming Arc====
The Homecoming Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. Notably it immediately picks up where the previous arc ended, namely the defeat of Kuroyoru Umidori and the return of Kamijou Touma. Leivinia Birdway, leader of the Dawn-Colored Sunlight Magic Cabal, has come to introduce Accelerator and Hamazura Shiage to the world of magic, as well as warn the three heroes of a new magical faction known as , born from the ashes of World War III.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Hawaii Invasion Arc====
The Hawaii Invasion Arc is a major story arc introduced in Shinyaku Toaru Majutsu no Index. The three heroes, along with Misaka Mikoto, Kuroyoru Umidori, and Misaka Worst, accompany Leivinia Birdway to Hawaii as they confront members of for the first time and thwart a plot against the United States of America.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Baggage City Arc====
The Baggage City Arc is a major story arc introduced in Shinyaku Toaru Majutsu no Index. It focuses on the events in the titular city as it becomes a battlefield featuring members of , the Kihara family, and the participants of the Natural Selector tournament, while Kamijou Touma tries to make up for his actions in Hawaii.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Ichihanaran Festival Arc====
The Ichihanaran Festival Arc is a major story arc introduced in Shinyaku Toaru Majutsu no Index. The events of the arc begin the day before the Ichihanaransai, and continue throughout the festival the day after, in mid-November.
It deals with the conflict surrounding , led by Othinus, and a group of incredibly powerful magicians, lead by Ollerus, centered around the mysterious being named Fräulein Kreutune, who resides in the Windowless Building, the final ingredient in Othinus' plan in creating Gungnir and forever distorting the world. Moreover, it also deals with the reaction of Academy City, and the conflict that arose after Kakine Teitoku returns and joins the foray.
*Light Novels: and 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Agitate Halation Arc====
The Agitate Halation Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs sometime in mid-November of the first year of the main story after the events of the Ichihanaransai in Academy City.
The story arc centers primarily around Fremea Seivelun, who is the linchpin of the plans concocted by Yakumi Hisako, a member of Academy City's Board of Directors, that on the surface tries to create a world without heroes: the Agitate Halation Project.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Magic God Othinus Arc====
The Magic God Othinus Arc is a major story arc introduced in Shinyaku Toaru Majutsu no Index. Initially, this story arc follows on from the previous arcs, with having acquired everything they need to forge Gungnir, which will unify Othinus' infinite possibilities, making her unstoppable. In response to this threat, various factions prepare to attack 's base in Sargasso to prevent the completion of the spear and the likely end of the world. However, the strength of the world fails and Othinus destroys and recreates the universe with Gungnir. Here, the story arc then focuses greatly on Kamijou Touma's character, as he withstands Othinus' torturing him via creating new layers of the world and recreating it many times over. Eventually, it reaches the point that they alone can understand each other in the shifting and fluctuating world that Othinus has created, and later, due to Othinus caring for Touma returns the world back to normal. Finally, the story arc returns to Touma's world before Othinus destroyed it and follows their journey to save Othinus and turn her back into becoming a human as the fairy spell that Ollerus used on her is slowly killing her. The arc primarily focuses on Touma and Othinus, but shows the overall effects of their actions on the world and its responses to them.
*Light Novels: , and 
*Manga Chapters: N/A
*Anime Episodes: N/A
===Fall of Academy City Arc===
After the defeat of and Magic God Othinus, Aleister Crowley is almost ready to put his plan into action. He just has to deal with the Magic Gods of the true , who want to make Kamijou Touma their "scorer", first. However, Aleister isn't the only one who wants to defeat the Magic Gods. Their recent doubts in Touma have caused the power known as World Rejector, which banishes those with conflicting ideals to a "new world", to manifest in the right hand of a "normal high school boy" named Kamisato Kakeru. Kamisato is surrounded by over 100 unique girls known as the Kamisato Faction, who's association with him he hates and blames on his right hand. Seeking revenge on the Magic Gods, he and his faction infiltrate Academy City and targets the true and Othinus, now a 15 centimeter fairy living with Touma and Index. Unfortunately, he also started trouble with Kihara Yuiitsu and their clash thrown Aleister's plans off track just as he got them back on track.
Academy City has been thrown into chaos. Catastrophe after catastrophe occur and each time things are looking better, more trouble occurs, all while Laura Stuart taunts Aleister in the background. He is now struggling to resolve all the problems and act on his master plan. But with Misaka Mikoto in possession of his Magic God killing Powered Suit; the Anti-Art Attachment and the conflict between Kamisato and Yuiitsu heating things up, will the Board Chairman's Plans ever be achieved?
====Mental Out Arc====
The Mental Out Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs sometime in late-November of the first year of the main story after the events of the of Magic God Othinus Arc.
The story arc centers primarily around the Level 5 Shokuhou Misaki, who finds herself trying to uncover a plot against her targeting her memories of Kamijou Touma.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====St. Germain Arc====
The St. Germain Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs on December 1st of the first year of the main story.
The story arc involves an incident at the Dianoid, sealed off from the rest of the city by the entity known as St. Germain. Among those trapped inside are Kamijou Touma, together with Index and Othinus, and a boy posing as the Number Six Level 5, Aihana Etsu.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Magic God Invasion Arc====
The Magic God Invasion Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs on December 3rd of the first year of the main story.
The story arc involves a destructive chase through Academy City between Kamijou Touma on an acrobike, together with Misaka Mikoto, and the Magic God known as the High Priest.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====World Rejecter Arc====
The World Rejecter Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs on the night of December 3rd of the first year of the main story.
The story arc involves a clash between Kamijou Touma and Kamisato Kakeru, the bearer of the World Rejecter who is targeting the Magic Gods, with the two also becoming involved in another clash, one between the two Birdway sisters.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Salome Arc====
 
The Salome Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs between December 4th - 6th of the first year of the main story.
With their school unusable following the High Priest's rampage, Touma and his classmates move to another school to continue lessons. Once there, Touma finds that Kamisato Kakeru has also transferred to this school. Meanwhile, Kamisato's sister, the Mass Murderer Salome, arrives in Academy City with her eyes on the Kamijou Faction.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Element Arc====
The Element Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs between December 7th - 9th of the first year of the main story.
After the disappearance of Kamisato Kakeru, a strange heat wave has overtaken Academy City. Along with it a swarm of powerful monsters known as Elements have appeared. Kamijou Touma must find a way to defeat the Elements and stop the heat wave in order to return peace to the city.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Kamisato Rescue Arc====
The Kamisato Rescue Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs between December 9th - 11th of the first year of the main story.
Following Kamisato Kakeru's exile to the new world, Kihara Yuiitsu has used the threat of losing the hope of getting him back to force the Kamisato Faction to follow her orders, and has sent them to kill Kamijou Touma. As Academy City enters a 48-hour restoration period, Touma seeks to rescue him and break Yuiitsu's hold over the girls, with the help of UFO girl Karasuma Fran.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Aleister Crowley Arc====
The Aleister Crowley Arc is a major story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs on December 11th of the first year of the main story.
Needing to escape after their encounter with Aleister Crowley, Tsuchimikado Motoharu and Karasuma Fran seek Kamijou Touma's help in escaping from the city. However after Maika is struck by Aleister's magic, the group are forced to break into the Windowless Building to find a way to safely remove it. While ascending the massive structure, Touma is shown a series of visions detailing Aleister's past.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Processor Suit Arc====
The Processor Suit Arc is a story arc introduced in Shinyaku Toaru Majutsu no Index. It occurs on December 11th and 12th of the first year of the main story.
Following the incident at the Windowless Building, Kamijou Touma finds himself accompanying Aleister, now in the form of a young girl, in search of the demon Coronzon's influence in the city. At the same time, Hamazura Shiage wakes up to find himself in a high-tech Processor Suit and mistaken for the culprit in an attack on a trading office. While being pursued by Anti-Skill and others, he finds himself looking after a certain baby.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Coronzon Arc====
The Coronzon Arc is a major story arc in Shinyaku Toaru Majutsu no Index, beginning on December 12th of the first year of the main story.
With Coronzon temporarily sealed in the evacuated Academy City, Kamijou Touma, Accelerator, Hamazura Shiage and a number of their allies accompany Aleister Crowley to the United Kingdom, currently under attack, in order to find the Great Demon's achilles heel before she breaks free once more. However, the demon's machinations have left many adversaries, obstacles and traps in their path.
*Light Novels: , & 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Kamijou Arc====
The Kamijou Arc is the final story arc in Shinyaku Toaru Majutsu no Index, occurring in December of the first year of the main story.
Following the final battle with Coronzon, a private party is held at Windsor Castle to celebrate, as the worlds of magic and science head towards a new era. The victory celebrations are cut short when a certain winged lizard crashes the party and it is revealed that something happened to Kamijou Touma at the end of the battle.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
==Souyaku Toaru Majutsu no Index==
===R&C Occultics Arc===
====Christmas Eve Arc====
The Christmas Eve Arc is the first story arc introduced in Souyaku Toaru Majutsu no Index, occurring on December 24th of the first year of the main story.
Due to having his remedial lessons scuppered, Kamijou Touma decides to spend his Christmas Eve in the city with Index and Misaka Mikoto. However the trio ends up in the middle of a conflict between Academy City's new Board Chairman and a member of the Board of Directors over the fate of the Dark Side of Academy City. At the same time, another threat works in the background with the intent of introducing the world of magic to the city of science and its inhabitants.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Christmas Day Arc====
The Christmas Day Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring on December 25th of the first year of the main story.
Following his encounter with Anna Sprengel, Kamijou Touma ends up in the hospital with an infection that threatens to kill him. Seeing that his life is at stake, Misaka Mikoto and Shokuhou Misaki team up to personally take on the Rosicrucian magician in the hopes of obtaining a cure, unknowing of the odds stacked against them.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Operation Handcuffs Arc====
The Operation Handcuffs Arc is a story arc in Souyaku Toaru Majutsu no Index, also occurring on December 25th of the first year of the main story.
Shirai Kuroko, who was hoping to enjoy the Christmas festivities with her roommate, finds herself assisting Anti-Skill carrying out in Operation Handcuffs. However, contrary to the plans of the new Board Chairman, it has become a violent conflict between Anti-Skill and the members of the Dark Side of Academy City, leading to Hamazura Shiage and Takitsubo Rikou looking for a way to escape the chaos. Not helping matters is the distribution of a new product from R&C Occultics.
This arc is the second one to not feature an appearance by Kamijou Touma. Instead, it features Shirai Kuroko and Hamazura Shiage as the focus characters, the former for the second time following the Tree Diagram Remnant Arc.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Los Angeles Arc====
The Los Angeles Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring on December 26th of the first year of the main story.
Following the crippling events of Christmas Day, Academy City and the Anglican Church have joined forces for a counterattack against R&C Occultics, but their enemy responds by causing the entire population of Los Angeles to disappear. Travelling to the empty and frigid city with Index, Stiyl Magnus and Kanzaki Kaori, Kamijou Touma finds himself fighting for the sake of a mother and daughter caught up in it all, while back in Academy City, Accelerator goes ahead with his trial.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
===Transcendent Arc===
====Post-Handcuffs Arc====
The Post-Handcuffs Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring on December 29th of the first year of the main story.
On December 29th, Kamijou Touma awakens to find that a mysterious girl named Alice has snuck into his blanket while he was asleep, complicating his already severe problems, in danger of being held back and with extremely limited funds to last the week. Things get worse when while shopping for food on the Delivery Go Round, the prison train Overhunting crashes and surviving prisoners from Operation Handcuffs escape into the city, causing Touma to be tangled up in the operation's aftermath and the lingering effects of Academy City's darkness.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====New Year's Eve Arc====
The New Year's Eve Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring on December 31st of the first year of the main story.
On December 31st, with his home situation dire, Kamijou Touma decides he must find part-time work in order to obtain enough money to survive until January 4th, and following the invitation of Kumokawa Seria, ventures outside of Academy City and into Shibuya. However, his previous adventure with Alice and the change it caused in her, has made him a target of her fellow Transcendents in the Bridge Builders Cabal, the group split between how to deal with the matter. On the side wishing to eliminate him, the witch goddess Aradia attempts to take Touma's life, with the boy only surviving her initial attack due to the intervention of the Bologna Succubus, on the side wishing to keep him alive for now.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
====New Year's Arc====
The New Year's Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring in the first days of January in the second year of the main story.
*Light Novels: , , & 
*Manga Chapters: N/A
*Anime Episodes: N/A
====Hell Tour Arc====
The Hell Tour Arc is a story arc in Souyaku Toaru Majutsu no Index, occurring on January 7th in the second year of the main story.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
==Toaru Kagaku no Railgun==
===Level Upper Arc===
The Level Upper Arc is a major story arc that occurs within the Toaru Kagaku no Railgun manga and anime. It is the first story arc that occurs within the Toaru Majutsu no Index universe. It focuses on the Level Upper, a device that is sought out after by many people in Academy City as a means to easily gain powers.
*Manga Chapters: , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , , , , , 
===Big Spider Arc (Anime-Only)===
The Big Spider Arc is a minor anime-original story arc that occurs in the first Toaru Kagaku no Railgun season following the Level Upper arc. It focuses on Big Spider, a faction of Skill-Out that has recently increased its attack on espers, and Konori Mii's involvement with them.
*Manga Chapters: Not included in the Manga
*Anime Episodes: , 
===Poltergeist Arc (Anime-Only)===
The Poltergeist Arc is an anime-original story arc that concludes the first Toaru Kagaku no Railgun season. It focuses on the series of earthquakes that are happening all around Academy City, which are called Poltergeist.
*Manga Chapters: Not included in the Manga
*Anime Episodes: , , , , , , , , 
===Sisters Arc===
The Sisters Arc is a major story arc in the Toaru Majutsu no Index universe. Originally only lasting a single volume in the light novels, it is later expanded greatly in the Toaru Kagaku no Railgun manga as its second arc.
The arc focuses on the ordeals of Misaka Mikoto after discovering the existence Misaka clones that are being used in the Level 6 Shift, an experiment where they are killed as so Accelerator can achieve Level 6. The Railgun retelling fleshes out Mikoto's struggles, featuring her early attempts to shut down the project, with the Dark Side group being sent out to stop her.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , , , , , , , , , 
===Silent Party Arc (Anime-Only)===
The Silent Party Arc is an anime-original story arc that occurs in the latter half of the Toaru Kagaku no Railgun S anime. It deals with Misaka Mikoto and her friends struggling against STUDY and the conspiracy that surrounds a mysterious girl they have met named Febrie.
*Manga Chapters: Not included in the Manga
*Anime Episodes: , , , , , , , 
===Daihasei Festival Arc (Railgun)===
The Daihasei Festival Arc (Railgun) is a major story arc in Toaru Kagaku no Railgun. Occurring on September 19 on the first day of Academy City's annual Daihaseisai, it is concurrent with the story arc from Toaru Majutsu no Index though doesn't interact with it. The story arc deals with a conspiracy involving during the events of the festival involving Mikoto's Sisters, Shokuhou Misaki, and eventually Misaka Mikoto herself.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , , , , , , , , , 
===Dream Ranker Arc===
The Dream Ranker Arc is a major story arc in Toaru Kagaku no Railgun. Starting on September 26, it is concurrent with several arcs in Toaru Majutsu no Index, starting with the La Regina del Mare Adriatico Arc and ending with the Acqua of the Back Arc, with one subplot serving as a prelude to the events of the Battle Royale Arc. The story arc deals with a series of events involving a group of people called Dream Rankers and the trend of sharing dreams using a specific kind of technology, culminating in an incident involving the technology's creator.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , , , , 
===Jailbreaker Arc===
The Jailbreaker Arc is a major story arc in Toaru Kagaku no Railgun. It features Misaka Mikoto and her friends participating in a contest to overcome the security features of Academy City's new private juvenile hall, only to be embroiled in a plot of a delinquent who used the contest to escape imprisonment and ensnare the contest's best hacker.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: Not included in the anime adaptation
======
The is a major story arc in Toaru Kagaku no Railgun. It focuses on the events of Misaka Mikoto's first year at Tokiwadai Middle School.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: Not included in the anime adaptation
==Toaru Kagaku no Accelerator==
===Necromancer Arc===
The opening arc of Toaru Kagaku no Accelerator, the Necromancer Arc deals with Disciplinary Action or DA, a rogue extremist group of Anti-Skill, and the parties manipulating them who make use of necromantic techniques.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: , , , , , , , , , , 
===Nectar Arc===
The Nectar Arc is the second and final story arc in the Toaru Kagaku no Accelerator manga, focusing on Himegi Matsuri, a girl with a mechanical heart involved in a case involving one of the Board Directors and pursued by the dark side group Full Course, as well as the circumstances of sisters Tobio Yumi and Mami.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: 
==Astral Buddy==
===Astral Buddy Arc===
The Astral Buddy Arc is the central story arc of the Astral Buddy manga. It is a side-story that takes place during the events of the Dream Ranker Arc.
It focuses on Hokaze Junko, the number two in Shokuhou Misaki's Clique, as she finds herself dealing with elements connected to her past at Ideal, including a supposed Ghost Girl who lost her memory.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: N/A
==Toaru Kagaku no Dark Matter==
===Yuzuriha Ringo Arc===
The Yuzuriha Ringo Arc is the central story arc of the Toaru Kagaku no Dark Matter manga.
It deals with Kakine Teitoku's meeting with Yuzuriha Ringo, a subject of the Dark May Project, and conflict with certain other parties over her.
*Manga Chapters: , , , 
*Anime Episodes: N/A
==Toaru Kagaku no Mental Out==
===Tokiwadai Election Arc===
The Tokiwadai Election Arc is the central story arc of the Toaru Kagaku no Mental Out manga.
*Manga Chapters: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 
*Anime Episodes: N/A
==Toaru Anbu no Item==
===Enemy Item Arc===
The Enemy Item Arc is the first story arc of the Toaru Anbu no Item light novels and manga, focusing on the formation of Item's initial four-person formation and their clash with another group using the name who are running an underground fight club.
*Light Novels: 
*Manga Chapters: , , , , , , , , , , , 
*Anime Episodes: N/A
===Honey Queen Arc===
The Honey Queen Arc is the second story arc of the Toaru Anbu no Item light novels, focusing on Item's battle against the data thieves Honey Queen.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
===Dark Justice Arc===
The Dark Justice Arc is the third story arc of the Toaru Anbu no Item light novels, focusing on Item facing several individuals and groups said to be on the side of 'justice'.
*Light Novels: 
*Manga Chapters: N/A
*Anime Episodes: N/A
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