In July 2116, the Southeast Asia Union (SEAUn) and the Japanese government begin to export the Sibyl System to the coastal town of Shambala Float during a civil war as an experiment in spreading the system throughout the world. Under Sibyl's rule, Shambala Float achieves temporary peace and safety, but when SEAUn sends terrorists to Japan, now able to slip through the Sibyl System and attack Japan from within, the shadow of a certain man falls on the incident and Inspector Akane Tsunemori must lead her team to Shambala Float to investigate.

(Source: Psycho-Pass Wiki)