A top secret American forces strategic bomber known as "Midnight Eagle" suddenly vanishes in the Northern Alps. Its payload is a specialized nuclear warhead. If it were to explode, the entire nation of Japan would be hurled into an unprecedented calamity. Prime Minister Takafumi Watarase convenes an emergency meeting of the Security Council of Japan. An elite squad from the Self-Defense Force able to operate in severe mountains conditions is formed, and heads off to try and recover the fuselage. Amidst the violent barrage of gunfire from agents of an enemy nation, an actual war is about to begin in the heart of Japan, 62 years after the end of World War II.