Toaru Majutsu no Index Wiki

The Element Arc is a story arc in Shinyaku Toaru Majutsu no Index, covered in Shinyaku Toaru Majutsu no Index Volume 16.

Following the disappearance of Kamisato Kakeru after Kihara Yuiitsu stole World Rejecter, Academy City has been hit by an abnormal heat wave exceeding 55 degrees, taking out the city's infrastructure. At the same time, the city has also been infested by life forms known as Elements.[1][Notes 1]



Main article: Element

In order to draw out the Kamisato Faction, who had disappeared after their initial confrontation, Yuiitsu unleashed the Elements, reduced life forms which were a hybrid of science and magic. Created in the shape of animals and plants, with a reverse of the process which converts animal and plant remains into petroleum over time, and animated by a magic-based core corresponding to one of the four elements,[2][1][3] the Elements possessed the ability to blend in with their surroundings.[1]

Heat Wave[]

After initial contact with the Elements, the Kamisato Faction performed experiments on captured subjects and determined that their activity was lowered in temperatures exceeding 40 degrees Celsius. Following this finding, Fran used her space station Bunny Grey Messenger to flood Academy City in microwaves, creating an artificial heat wave with temperatures exceeding 55 degrees Celsius.[4]


December 7th[]

December 8th[]

December 9th[]


  1. There are a number of dating discrepancies between volumes taking place during December. In Shinyaku Toaru Majutsu no Index Volume 16 and Shinyaku Toaru Majutsu no Index Volume 17, there are several references to the rapid onset of the heat wave and the Elements occurring on December 4th. This directly contradicts the events of Shinyaku Toaru Majutsu no Index Volume 15 and the previous two volumes. This article and the Unified Story Timeline proceed on the assumption that the references to December 4th in Volumes 16 and 17 are erroneous.



v  e
Story Arcs
Toaru Majutsu no Index Academy City Arc Index ArcDeep Blood ArcSisters ArcAngel Fall ArcThree Stories ArcKazakiri Hyouka ArcOrsola Aquinas Rescue ArcTree Diagram Remnant ArcDaihasei Festival Arc
Versus Roman Catholic Church Arc La Regina del Mare Adriatico ArcAcademy City Invasion ArcSkill-Out UprisingDocument of Constantine ArcBattle Royale ArcAcqua of the Back ArcBritish Royal Family ArcDRAGON ArcWorld War III Arc
Shinyaku Toaru Majutsu no Index Gremlin Arc Freshmen ArcHomecoming ArcHawaii Invasion ArcBaggage City ArcIchihanaran Festival ArcAgitate Halation ArcMagic God Othinus Arc
Fall of Academy City Arc Mental Out ArcSt. Germain ArcMagic God Invasion ArcWorld Rejecter ArcSalome ArcElement ArcKamisato Rescue ArcAleister Crowley ArcProcessor Suit ArcCoronzon ArcKamijou Arc
Souyaku Toaru Majutsu no Index R&C Occultics Arc Christmas Eve ArcChristmas Day ArcOperation Handcuffs ArcLos Angeles Arc
Transcendent Arc Post-Handcuffs ArcNew Year's Eve ArcNew Year's Arc
Toaru Kagaku no Railgun Level Upper ArcBig Spider ArcAPoltergeist ArcASisters ArcSilent Party ArcADaihasei Festival ArcDream Ranker ArcJailbreaker ArcFirst Year Arc
Toaru Kagaku no Accelerator Necromancer ArcNectar Arc
Astral Buddy Astral Buddy Arc
Toaru Kagaku no Dark Matter Yuzuriha Ringo Arc
Toaru Kagaku no Mental Out Tokiwadai Election Arc
Toaru Anbu no Item Enemy Item ArcHoney Queen ArcDark Justice Arc