Advanced Education Department

The Advanced Education Department (先進教育局) is a now-abandoned establishment in Academy City that was used to educate and facilitate the care of Child Errors during its time in operation. It is a large facility, with an open space that the Child Errors had used to play on. It also has a large laboratory for experiments, as well as classrooms and showers for children.

Background
Under the supervision of Kihara Gensei, Kiyama Harumi, who had gotten a license to teach, was tasked with teaching Child Errors so that they can be prepared for the upcoming experiment on controlling espers' AIM diffusion fields. However, the experiment went awry, putting the children into a comatose state. No immediate medical assistance was given to the children after the experiment, as Gensei had forced everyone to collect the data gathered from it and keep quiet on what had transpired. Because of these events, Kiyama Harumi quit the facility, and the children were sent to various hospitals around Academy City. It is later revealed that the experiment was a cover-up by Gensei; its true nature was to analyze the nature of out-of-control espers and further his research on the Crystallized Esper Essence.

Level Upper Arc

 * Main article:Level Upper Arc

The building is first seen when Misaka Mikoto accidentally connects with Harumi's memories after electrocuting her.

Poltergeist Arc

 * Main article:Poltergeist Arc

Having a hunch of the recent Poltergeist earthquakes happening all around the city, Mikoto infiltrates the building in hopes of finding clues. Inside the building, she once again meets Harumi, who had been recently released and is now trying to search for data on the Crystalized Esper Essence that was used on her students. The two of them leave the facility after Mikoto accidentally reactivates the building's security system.