Psycho-Pass: Inspector Shinya Kogami Volume 6

The perfect society and its price…the manga prequel to the acclaimed anime series!
 
In the 22nd century, the Psycho-Pass is a system that measures emotional health, making crime not only rare, but strange and dangerous—and the only “safe” job for a person on the borderline is as a cop…kept on a virtual leash as they hunt down the criminals they may soon become themselves!

The explosive conclusion! As Division 3 races to try to save the life of Professor Toshi, they find that the trauma unit within the Special Sector has become a deadly trap. But in this high-tech underground complex, it’s a hidden cache of a very obsolete information storage format—handwritten letters—that may provide the last clue that must be understood by Inspector Kogami…before the elders behind this hidden kingdom of guilt decide to carry out their final act of atonement!