Tokyo Devil Detention Center

The compound reads as an enormous, military-grade structure, its outer walls striped with wide rectangular panels. Inside run long stretches of corridor patrolled by armed staff, and most of the visible rooms serve as cells for inmates such as a cluster of Pseudo-Chainsaw People or the captured Devil Hunter Club members. According to Fami, Chainsaw Man himself is kept three floors down in the basement.

Little is recorded about the facility beyond its grim purpose: devils judged too dangerous for anywhere else are sent here, and since it opened not one had survived to leave. In the Aging Devil arc, Denji is sedated for a week and brought in to be taken apart after transforming against Public Safety's wishes. Asa Mitaka, Yoru, and Fami break in to free Chainsaw Man, picking up allies along the way including the Devil Hunter Club trio, Katana Man, and the Nail Fiend. They reach him only to find the surgeons have already cut him to pieces, and once reassembled his true identity is exposed as Denji. The veteran Quanxi then corners the group under orders to keep them from leaving, overpowering them but relenting at the sight of Denji's severed head. Her companion Takagi is devoured by his own Pseudo-Chainsaw wife, and Yoru beheads Quanxi at the veteran's own request before the group finishes rebuilding Denji and slips out to recover at Fami's apartment.

The building is engineered to stop break-ins as surely as escapes. Sensors near the entrance flag anyone slipping inside and feed a control room, whose operators can open up with mounted gun turrets to cut down intruders. Backed by the roaming armed guards, those defenses make unauthorized passage in either direction a deadly proposition.