PSYCHO-PASS 0 名前のない怪物

Mitsuru Sasayama works as an Enforcer with Division 1 of the Public Safety Bureau, three years before the events of the Psycho-Pass anime. A string of murders staged with deliberate cruelty, the Specimen case, has the division chasing whoever is arranging the bodies. Sasayama pushes at it harder than an Enforcer is meant to, under a Sibyl System that scores the mind of anyone who looks too closely at what it cannot explain. The book is a prequel rather than a side story.