In the story, a black hole suddenly appears in the South Pole, and is expanding rapidly. Concerned, the United Nations sends a team composed of soldiers and researchers from all over the world to explore and investigate the anomaly, dubbed "Schwarzwelt". However, upon arrival, the investigation team discovers that the area is inhabited by demons.
The player controls an unnamed American soldier (Japanese in the original version), and must then make choices that might affect the future of humanity.
