In the hyper-urban city of Zero Rook, humans and machines coexisted peacefully. However, one day, energy from a meteorite falling from space caused the main computer "Zero In," which managed the city, to malfunction, identifying humans as enemies and initiating plans for its own domination. Jurer, a member of the city defense force, steals data on Zero In's secret cyborg development project and single-handedly confronts the rogue system to stop its rampage. Yet, her actions lead to unforeseen consequences, driving the story toward a tragic conclusion. [BAD END]