The story covers the Specimen case three years prior to the anime.
 
Sasayama Mitsuru is an Enforcer who works at the MWPSB Unit 1, searching the mastermind behind a case involving gruesome murders.

In this prequel to the hit science-fiction crime drama anime series, Psycho Pass: Inspector Shinya Kogami reveals how the legendary Enforcer was once an ace detective! Working within the city-regulating Sybil System, Inspectors must fight crime in a future where a single number measures your criminal tendencies and determines if you are useful to society! 
 
(Source: Dark Horse)

Justice, and the enforcement of it, has changed. In the 22nd century, Japan enforces the Sibyl System, an objective means of determining the threat level of each citizen by examining their mental state for signs of criminal intent, known as their Psycho-Pass. Inspectors uphold the law by subjugating, often with lethal force, anyone harboring the slightest ill-will; alongside them are Enforcers, jaded Inspectors that have become latent criminals, granted relative freedom in exchange for carrying out the Inspectors' dirty work.
 
Into this world steps Akane Tsunemori, a young woman with an honest desire to uphold justice. However, as she works alongside veteran Enforcer Shinya Kougami, she soon learns that the Sibyl System's judgments are not as perfect as her fellow Inspectors assume. With everything she has known turned on its head, Akane wrestles with the question of what justice truly is, and whether it can be upheld through the use of a system that may already be corrupt.
 
(Source: MAL Rewrite)
 
Note: In the Summer 2014 season, Psycho-Pass was rebroadcast and re-edited to fit into an hour time-slot, ending up in 11 one-hour episodes. This edit included added scenes at the beginning and middle of the episodes, as well as fixing and improving animation.

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