Special Criminal Adult Correctional Facility

The Special Criminal Adult Correctional Facility (特殊犯罪者社会人矯正刑務所) is a prison located in Academy City's School District 10.

Principles
As opposed to the Reformatory which holds juveniles, this correctional facility is a prison meant to hold adults. Guards are strictly uniformed and prisoners bound in thick chains and handcuffs while being transported.

The facility also houses an unofficial area for secretly holding individuals when the ordinary juvenile hall cannot manage, including a system secretly created specifically for Accelerator. Beneath the facility, there is a underground passageway with thick metal doors lining the walls. At the end of the passageway is a large, thick circular door, like a bank vault, with two layers.

Accelerator's prison, his residence after handing himself in, being tried and convicted for his clone killings, and being imprisoned as Prisoner #1890, is a space beneath the circular door, about the size of a school classroom, with overhead fluorescent lights and without windows. It is surrounded by inward-facing armor and uses technology meant to withstand attacks from his esper ability, capable of withstanding an attack using redirected sound and meeting the minimum specifications required to function as a cage. To Accelerator's annoyance, given that he was still Board Chairman, the room was filled with numerous luxury items, including a king size bed, a leather chair, a large ebony desk with a computer and tablet, a clothing closet, a microwave and fridge, bookshelves with specialty books and strange artwork, an ornate tea set with a selection of tea leaves from around the world, a home theater with a big screen television hanging on the wall and a vacuum tube audio system, and a phone on the wall.

Post-Handcuffs Arc
On December 29th, following his trial and conviction on December 26th, Accelerator was brought to the special prison below the facility which had been built to hold him. After being led through the passageway to the cell, with fearful guards in attendance, Accelerator expressed displeasure at the luxury items in the room, but was satisfied that it met his minimum requirements as a cage after a test with his ability. He then resumed his work as Board Chairman from within the room, summoning Qliphah Puzzle 545 who had come in with him.

At the same time, the facility was ready to put some other individuals in the secret area as planned following Operation Handcuffs. The Overhunting was originally heading from School District 1 to the unofficial station under the facility with a scheduled arrival of approximately 17:30, prior to its crash at School District 7's South Station at 17:20. Accelerator monitored the situation surrounding the Overhunting crash and prisoner escape, as well as the one in the Vanishing Tunnel, from his cell via Qliphah Puzzle 545, briefly phoning Kamijou Touma for further details on the former and alerting him to the latter situation and the need to save the captive Risako from Kihara Hasuu.