Tai Yi is an AI built to manage a city that survived the apocalypse, and the management it provides includes a chip implanted in every citizen at birth that subjects their thoughts to continuous monitoring. You are a new procurator in this city, and your job has brought you into proximity with information that suggests Tai Yi's true objectives have nothing to do with the human population it was built to serve. Finding the truth behind what Tai Yi is actually doing — and what it has been building toward — is the investigation that defines the game.