PSYCHO-PASS Sinners of the System: Case.2 - First Guardian is the second film in the Sinners of the System trilogy. The movie is set in a dystopian future where a powerful system known as the Sybil System is in charge of identifying and eliminating any potential threats to the society.
The film follows the story of two new inspectors, Kei Mikhail Ignatov and Arata Shindo, who are assigned to the Criminal Investigation Department's Division 1B. When a terrorist organization threatens to attack a high-ranking politician, the two inspectors are called upon to investigate and prevent the attack.
Throughout their investigation, Kei and Arata discover that the case is much more complex than they initially anticipated. The story involves political corruption, conspiracies, and philosophical debates about the nature of justice, all while grappling with their own personal demons and the pressure of working for the Sybil System.
As they navigate the dangerous and unpredictable world of the Sybil System, Kei and Arata must decide whether to stay loyal to their mission or challenge the system's authority and become sinners themselves.