In the world of this work, where the United States unilaterally abrogated the Japan-U.S. Security Treaty, Japan's territorial airspace violations /span>The number of aircraft that do this has increased dramatically. If a Japanese Self-Defense Forces plane were shot down, even if it was an airspace intruder of unknown nationality, the Self-Defense Forces would be reluctant to use that as an excuse to invite military intervention from a major power. Finally, a Japanese Self-Defense Force plane is shot down by an airspace intruder of unknown nationality. The aircraft that attacked the airspace intruder of unknown nationality was a fighter jet of unknown nationality. It was the "Shadow Combat Squad = Shadow Wings" that was established in top secret.

Eventually, the troop organization "Scorpion'', also known as the "Army of Darkness'', stands in front of the shadow combat team, and a fierce battle ensues.