The story's backdrop is a dystopian future Tokyo where people can be preemptively imprisoned for their propensity to commit crimes, based on a technology-enabled personality scan called a Psycho-Pass. The game takes place in a timeline within the anime's first 8 episodes. Source: Wikipedia, "[en.wikipedia.org/wiki/Psycho-Pass%3A_Mandatory_Happiness Psycho-Pass: Mandatory Happiness]", available under the CC-BY-SA License.