|This article contains information about Ace Attorney media that has been released only in Japan.|
If you have personal experience with the item of media in question, you can help the Ace Attorney Wiki by improving on this article. Please heed the manual of style when adding information.
|Link to the template page|
|Available evidence||Manosuke Naitō's memo|
|Locations in detention center|
Not shown: Visitor's room
The detention center contains a holding cell used for detaining criminal suspects. A partial map of the detention center indicates that there are at least eight cells in the detention center, one of which held Manosuke Naitō after his arrest.
A bed, a toilet and a sink are provided for basic needs. A security camera situated just outside the cell can peer into a small portion of the cell, and it can be seen from a mirror near the sink. A desk with a bookshelf and a food menu is also provided. Aside from the standard meals for detainees, additional food from the menu can be delivered if they pay with their own money. The first meal of the day is determined by shaking dice. The bookshelf contains books written by current and former prisoners.
- Main article: The Imprisoned Turnabout
When Manosuke Naitō was arrested under charges of an attempted assassination of President Teikun Ō of Zheng Fa, he was detained in the holding cell. By this time, however, a prison inmate named Shūji Orinaka had dug a tunnel leading to the holding cell from his own cell. The day after Naitō's arrest, he and a guard escort were attacked by Orinaka. The prisoner wiped a bloodstain on the floor near the bed using a nearby newspaper, then stole the keys to the holding cell and returned to prison, planning to escape the next day. When other prison guards were made aware of the scene, they blamed Naitō for the attack and searched for the keys to no avail.
During Naitō's stay, he engaged in correspondence chess matches with his friend Sōta Sarushiro. Unbeknownst to him, however, he was not actually playing against his friend; his real opponent was Ryōken Hōinbō, an assassin who was being held at the prison. Marī Miwa, the prison warden, intercepted Naitō's mail and suspected that the man was one of Hōinbō's henchmen. The night after Orinaka's attack, Miwa called Naitō out of the holding cell to interrogate him.
The next morning, Orinaka returned to the holding cell to make his escape, using a security guard's uniform that had been stolen for him. Before he could open the door, however, his pet polar bear Mark chased after and latched onto him, resulting in a struggle that was partially caught on the security camera. The camera did not catch Orinaka's face, and thanks to Frank Sahwit's mud packs, Mark was covered in mud, making him appear dark. Orinaka reluctantly returned to the prison again to wait for another opportunity, only to learn that Naitō had been found dead inside a prison workroom.
Miles Edgeworth, the prosecutor in charge of Naitō's case, soon learned of the murder and conducted an investigation. During his investigation of the holding cell, Edgeworth learned of the security footage of Orinaka's escape attempt, but mistook Orinaka for Naitō and mistook Mark for Hōinbō's dog Kuro. This led him to believe that Kuro had killed Naitō in the holding cell. He corrected this theory after discovering Orinaka's tunnel.