Story Structure — 5 Plot Phases
Season 1: Sisters & Virus
Index arrives and becomes entangled in Academy City's dark experiments, while Mikoto and Accelerator clash over the Sisters project, culminating in Last Order's rescue.
Key Events
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Index's Arrival — Index arrives at Tōma's balcony, revealing her status as a living library. Characters: Index
Location: Academy City
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Sisters Project Revealed — Accelerator kills clones, revealing the Sisters project's dark nature. Characters: Mikoto Misaka, Accelerator
Location: Academy City
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Mikoto vs Accelerator — Direct confrontation between Mikoto and Accelerator over the Sisters. Characters: Mikoto Misaka, Accelerator
Location: Academy City
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Last Order Introduction — Last Order appears, connecting Accelerator and Index through the virus plot. Characters: Accelerator, Index
Location: Academy City
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Virus Code Climax — Accelerator removes the virus, resolving the Sisters project crisis. Characters: Accelerator, Index
Location: Academy City
Season 2: Magical Invasions
Index is kidnapped, triggering magical conflicts, while Accelerator and Index face Hound Dogs and Vento's attack, shifting dynamics toward indirect cooperation.
Key Events
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Index Kidnapped — Index is kidnapped, triggering a city-wide search and magical conflict. Characters: Index
Location: Academy City
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Amakusa Church Conflict — Conflict over The Book of the Law escalates, involving Index and magicians. Characters: Index
Location: Amusement Park
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Daihasei Festival — Festival events bring Mikoto and Index into closer daily proximity. Characters: Mikoto Misaka, Index
Location: Academy City
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Hound Dogs Assault — Accelerator and Index are targeted by Hound Dogs, forcing indirect cooperation. Characters: Accelerator, Index
Location: Academy City
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Vento Attack — City-wide magical attack forces Index and Accelerator into crisis response. Characters: Index, Accelerator
Location: Academy City
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Academy City Unrest — Tensions rise as Index and Mikoto navigate Academy City's political shifts. Characters: Index, Mikoto Misaka
Location: Academy City
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Constantine's Document — Index's involvement in the C Document plot escalates international tensions. Characters: Index
Location: Avignon
Season 3: Global Conflict
International tensions escalate, pulling Index, Mikoto, and Accelerator into British and Russian crises, culminating in the Archangel Gabriel and Fiamma confrontations.
Key Events
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British Labyrinth — Index and Mikoto navigate British political and magical conflicts. Characters: Index, Mikoto Misaka
Location: United Kingdom
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DRAGON Hunt — Accelerator and Index are drawn into the DRAGON investigation. Characters: Accelerator, Index
Location: Academy City
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Russian War Declaration — Global conflict erupts, pulling all three into international crises. Characters: Index, Mikoto Misaka, Accelerator
Location: Russia
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Misaka Worst Confrontation — Accelerator faces Misaka Worst, confronting the Sisters project's legacy. Characters: Mikoto Misaka, Accelerator
Location: Elizalina Alliance
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Archangel Gabriel Fight — Index and Accelerator converge to defeat Archangel Gabriel. Characters: Index, Accelerator
Location: Star of Bethlehem
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Fiamma's Assault — Index's grimoires are weaponized, leading to a final confrontation. Characters: Index, Mikoto Misaka
Location: Star of Bethlehem
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Series Resolution — Crisis resolves, relationships solidify across shared trauma and victory. Characters: Index, Mikoto Misaka, Accelerator
Location: Star of Bethlehem
S1-S2 Transition: Aftermath
The immediate aftermath of the Sisters project leads to daily routine shifts and indirect connections between the three characters.
Key Events
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Virus Code Climax — Accelerator removes the virus, resolving the Sisters project crisis. Characters: Accelerator, Index
Location: Academy City
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Index Kidnapped — Index is kidnapped, triggering a city-wide search and magical conflict. Characters: Index
Location: Academy City
S2-S3 Transition: Escalation
Magical and scientific crises converge, forcing the characters into global conflicts and solidifying their complex alliances.
Key Events
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Academy City Unrest — Tensions rise as Index and Mikoto navigate Academy City's political shifts. Characters: Index, Mikoto Misaka
Location: Academy City
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Constantine's Document — Index's involvement in the C Document plot escalates international tensions. Characters: Index
Location: Avignon
Touma Kamijou is a student living in Academy City, a highly advanced place in terms of technology. Despite being gauged as a level zero esper (no powers), he possesses on his right hand the Imagine Breaker, an ability that negates any power whatsoever.
Touma finds a young girl named Index who is trying to run away from Necessarius, a powerful magic organization that she is member of. Blessed with the skill of memorizing any sort of information, she holds 103,000 forbidden magical books within her head.
As science and magic cross paths, Touma must face several dangers amid espers and magicians who appear in the exciting scientific town.