Windowless Room

The Windowless Room is a room located within a certain Anti-Skill station, where Board Chairman Accelerator dwells following the start of Operation Handcuffs.

Principles
The secret room is located deep within a certain Anti-Skill station. Not found on any official diagrams, it is an interrogation room used for cases requiring utmost secrecy before law enforcement makes its move and where a minimum number of officers make final checks before beginning actual investigation of large-scale corruption, bribery and other similar crimes.

It is a small room, without windows, only containing a clear table and two cheap chairs. There is also a special mirror on the interrogation room wall. There is an inner door leading into the room, locked by rods, and a large outer door with composite armor, with a cramped space between them. The two doors provide extra security but also prevent guards from spying on the interior.

The room is at the end of a long winding corridor, with meaningless steps up and down and obstacles reflecting electromagnetic and infrared signals inconspicuously worked into architecture. It is designed to prevent wheels and treads passing, and to obstruct the movements of indoor combat drones (the basic principles being noted as being the same of an old samurai mansion, though their design was for making wielding weapons difficult). Although governments would not normally allow an intentional building design preventing wheelchairs and crutches from getting through, the nature of the room and the need to protect its contents necessitates breaking those rules. There are no security cameras to avoid the risk of hacking and information leaking to the outside.

At the time of Operation Handcuffs, body checks were carried out both at the start of the corridors leading to the room and at the entrance to the room itself, including the use of a terahertz radiation sensor to detect non-metallic objects. In addition to a guide leading visitors down the corridor, a guard working directly for the Board Chairman was stationed at the entrance to the room.

Christmas Eve Arc
On December 24th, Yomikawa Aiho met with Board Chairman Accelerator, who had turned himself in to Anti-Skill for his past crimes as part of Operation Handcuffs, his plan to eliminate the Dark Side of Academy City, in the 'windowless room' and discussed the imminent operation. He remained there during the attempt to kidnap Last Order by individuals seeking to preserve the dark side and the subsequent battle against them, despite being easily capable of breaking out and ending the matter himself, choosing to believe in the city he was to lead. Yomikawa left, after Misaka 10032 brought Last Order to the safety of the station, to participate in the operation. After the incident was resolved, Last Order visited Accelerator and tearfully accepted his decision, with Qliphah Puzzle 545 present nearby.