A year and a half after the events of the first sci-fi psychological thriller, Akane Tsunemori is still working as an inspector, implementing the Sibyl System's decisions. New enforcers and junior inspector Mika Shimotsuki, a young lady hopelessly and inflexibly faithful to Sibyl, join her. As Akane mulls about the nature of her employment as well as the legality of Sibyl's rulings, a terrible new threat arises.