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Child Errors

Child Error (置き去りチャイルドエラー Okizari (Chairudo Erā)?, lit. "Desertion") is a term used to refer to children who for various reasons were abandoned by their parents or guardians in Academy City.[1] In layman's terms they are orphans that are residing within Academy City. Child Errors range from powerless Level 0s to higher leveled espers.


Academy City's response on Child Errors[]

Like many modern cities, there are many orphanages such as Asunaro Park and the Advanced Education Department, built to provide care for children abandoned in Academy City, these facilities provide basic education to the children and probably many other necessities.[2]

However not all facilities were built in the pure effort on providing for the Child Errors, as with the case of the Child Errors overseen and taught by Kiyama Harumi, who from the very beginning knew that they were to be used in an experiment led by Kihara Gensei in developing the Crystallized Esper Essence under the pretense of it being relatively safe and harmless, the children were sent into an indefinite coma by the experiment, and were deprived of immediate medical assistance.[1] It is unknown how many other Child Error experiments are occurring within the city.

Apparently, Academy City seems to only be concerned that the now 'missing' parents/guardians are no longer paying tuition.[1]

Future of Child Errors[]

Like many orphans outside of Academy City, Child Errors are capable of attaining a better life.[3][4] However it is highly likely that Child Errors end up as members of Skill-Out gangs.


This section requires expansion
Arc divisions

Toaru Kagaku no Railgun[]

Child Errors feature prominently in Toaru Kagaku no Railgun.

Level Upper Arc[]

Main article: Level Upper Arc

Poltergeist Arc[]

Main article: Poltergeist Arc

The Child Errors that are within Kiyama Harumi's care that have become comatosed is the catalyst of the events in the series. It allowed for the development of the Level-Upper by Harumi and the Crystalized Esper Essence developed by Gensei and Therestina and also the Poltergeist Incidents that occurred within the city.

Jailbreaker Arc[]

Main article: Jailbreaker Arc

Souyaku Toaru Majutsu no Index[]

Operation Handcuffs Arc[]

Main article: Operation Handcuffs Arc

Notable Child Errors[]


  • There are some hints from Accelerator's past which may indicate that he used to be a Child Error, like his lack of attachment to his family name.[citation needed]
  • It is also suggested that Kinuhata Saiai was a Child Error due to her involvement in the Dark May Project same as Kuroyoru Umidori.[citation needed]



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