Toaru Majutsu no Index Wiki

School District 21 (第二一学区 Dai Nijūichi Gakku?) is the westernmost School District of Academy City. The district's primary use is for water storage,[1] and astronomical observation facilities.[2]


Unlike School District 23, which is flat due to its many runways, School District 21 is a mountainous area.[2] The mountainous area holds many dams that act as the city's water source. The water is distributed to the whole of Academy City using pipes, from uses such as beverage service to industrial use.[3]



The stars in the night sky can be seen more clearly in the district than the rest in the city.[4] Perhaps because of this, the district contains several astronomical observation facilities.[2] The area is also the location of an experimental geothermal power station situated on the mountain's peak,[5][6] and a large-scale meteorological observatory, which is also the base for the disaster recovery group Useful Spider.[7]

The district also keeps wilds animals due to its mountainous area.[4]


This section requires expansion

Toaru Majutsu no Index[]


Main article: DRAGON Arc

Shinyaku Toaru Majutsu no Index[]

Kamisato Rescue Arc[]

Main article: Kamisato Rescue Arc

Toaru Anbu no Item[]

Honey Queen Arc[]

Main article: Honey Queen Arc
This section requires expansion
Item V2[8][9]

Between August 5th and 6th, one year prior to the main story, Item rented a cottage in the mountains of the district as a temporary base during the mission against Honey Queen, after the initial airship reservation proved unpopular in the face of an approaching typhoon.[8][9]

Dark Justice Arc[]

Main article: Dark Justice Arc

On August 29th, Item visited the district to raid a dark side bond builder, based out of an RV in the district, for information on a recent client and Item's current enemy, Sadistic Dolls.[10][11]

Known Locations[]

Location Type Details
Nature Park Park [12]
Ground Geo Power Station [6]
Mars World Research Facility [4]
Observatory (天文台?) [13][14]
Matsuo Ryuusuke's log cabin A log cabin near Ground Geo which acted as a secret hideout for L.S.S. president and Biohacker Matsuo Ryuusuke, and contained many of his created specimens. Destroyed by the Beginning Child after her awakening.[15]



v  e
Academy City
Inhabitants Faculty and Staff Students
Factions and Organizations Board of Directors (Board Chairman) • JudgmentAnti-SkillCooperative InstitutionsUseful SpiderSkill-Out
Locations School Districts School District 1 (Administration) • School District 2 (Military & Law Enforcement Training) • School District 3 (Outsider Accommodation) • School District 4 (Food) • School District 5 (Universities and junior colleges) • School District 6 (Recreation) • School District 7 (Middle & High Schools, Student Accommodations, Hospitals) • School District 8 (Faculty Accommodation) • School District 9 (Industrial and fine arts) • School District 10 (Reformatory, Nuclear Research, Cemetery) • School District 11 (Goods transfer) • School District 12 (Theology) • School District 13 (Kindergarten and primary schools) • School District 14 (Overseas Students) • School District 15 (Shopping & Mass Communication) • School District 16 (Commerce) • School District 17 (Industry) • School District 18School District 19School District 20 (Sports and athletics) • School District 21 (Water storage & Observatory) • School District 22 (Underground development) • School District 23 (Aerospace)
Other Notable Locations School District 7: Windowless BuildingHeaven Canceller's HospitalA Certain High SchoolKamijou ResidenceSchool Garden (Tokiwadai Middle School)
Other: Imaginary Number DistrictReformatoryExternal Connection Terminals
Power Curriculum Program Esper (Level 0Level 1Level 2Level 3Level 4Level 5Level 6 (SYSTEM)) • Personal RealityEsper AbilitiesAIMSystem ScanLevel 6 ExperimentsParameter List
Notable Technology Tree DiagramHikoboshi IIBankAirshipCleaning RobotSecurity RobotWind TurbinePowered SuitNanodeviceSupersonic Passenger PlaneHard Science
Events (Timeline) Regular DaihaseisaiIndependence DayIchihanaransaiSummer City Flood Prevention ProgramAnti-Crime Orientation
Other 0930 IncidentInterceptor ShowAvignon Cleanup OperationWorld War IIIDecember Heatwave48 Hours to Restore OrderEvacuation of Academy CityOperation Handcuffs
Other ScienceExperiments and ProjectsChild ErrorMagic-Science TreatyAcademy City Military
See also: Dark Side of Academy City