Misawa Cram School

Misawa Cram School (三沢塾) is a cram school or juku found in Academy City in the 17th School District. Unlike regular schools in the Toaru Majutsu no Index universe, it built to look more like a office building than a school. The school consists of two twin buildings several storeys in height, with a skyway built in the middle of it. The building contains elevators, a cafeteria and probably several classrooms, as well as a large office.

Many students of different schools attend Misawa Cram school.

Background
According to Stiyl Magnus, the school has degenerated into a cult that centers its worship on science, converting people by saying rare abilities can be copied and given to someone else. They have captured Himegami Aisa and planned to use her as part of their plans, though anyone with a rare ability would have sufficed. Aureolus Izzard then took over the school and destroyed the cult, as he needed Himegami himself to obtain a vampire. Aureolus then converted the cram school into his fortress, described by Index as the same as a pharoah's tomb in the sense there are no mana in the building, natural or otherwise, since most have been artificially removed by magic. Aureolus have also had barriers put around it to prevent Himegami's power from working to protect her, though this means Himegami would have to leave occasionally in order to attract vampires.

Aureolus also created a seal on the entire building, rendering intruders unable to interact with its students and machinery. However, he can also force the students to interact with the intrudents, at which point the students that are under Aureolus' control will attack the intruders.

Deep Blood Arc
Teachers of the school first appear to escort Aisa from MacRonall Hamburger, which made Kamijou Touma - who just had recently met her in the restaurant - suspicious of them and Aisa. The actual school is later seen, after Stiyl recruits Touma into saving Aisa from Aureolus Izzard, after threatening Index if he didn't agree.

Inside, it is revealed that the Thirteen Knights of the Roman Catholic Church has been defeated by Aureolus. A corpse is found inside the building which makes Touma wonder on how the students don't see it. This leads Stiyl to tell him that the building is covered in a seal that puts them and the corpse in the inner side of a coin so-to-speak, while the students are on the outer side, which makes them unable to interact with them and the machinery in the building and vice-versa. The students are later forced into the inner side of the coin and attacks both Stiyl and Touma with a replica of Gregorio's Chant, though the core of the seal is eventually destroyed by Stiyl.

Later, Index herself gets involved in the predicament after she follows Stiyl's mana trail and is found by Aureolus and takes her in his office. The building is later razed temporarily by the remaning Knights of the Roman Catholic Church by using the original Gregorio's Chant; though the attack was reversed by Aureolus' Ars Magna and restores the building fully, he also severely weakens the Roman Catholic Church's power because of this.

After Aureolus' defeat, Misawa Cram School gets closed down.

Trivia

 * The school building is featured in the background of the 2nd novel volume's cover.