Japan

The State of Japan (日本 Nippon) is an Asiatic island nation located in the Pacific Ocean, east of the Sea of Japan. One of the world's greatest powers, Japan is notorious for many things and achievements, including the largest metropolitan center in the world (Tokyo), the world's tenth largest population at over 127 million, as well as the second largest economy by nominal GDP and the world's highest levels of life expectancy. It is also home to several cultures, the most notorious of which is the animé culture.

Ace Combat X2
More information: Midway Incident

The story of Ace Combat X2: Joint Assault begins in Japan.

The game begins some time after the 2007-2010 global economical crisis, with the player taking the role of Antares One, a recruit pilot whose first day in the line of duty involves a joint military exercise between the private military contractor Martinez Security, the United States 7th Fleet and the Japan Maritime Self-Defense Force in the Midway Islands.

Antares successfully destroys his first targets (unmaned drones), however a group of unidentified aircraft approached from the east, heading westward. The unknown Phantoms were shot down in a short engagement, however officer Fredric Burford would announce that the bandits were part of a much larger formation heading towards the capital city of Tokyo. The opposing force, calling themselves Valahia, launched an airstrike on Tokyo, and the 7th Fleet requested support from Martinez Security.

Shortly thereafter, aircraft from Martinez and the Japan Air Self-Defense Force traveled westbound towards Tokyo. Upon arriving to the city, they discovered that a gigantic airship was spearheading the assault on Tokyo. Thanks to efforts from both sides, the airship, called Spiridus, suffered extensive damage which forced it to retreat from the metropolis, thus leading the SDF to clean up the skies from the remaining Valahian fighters. Some time later, Martinez & the SDF cooperated again, this time to intercept Valahian forces approaching from the Izu Islands.

The Valahia conducted a third attack on Tokyo after Izu Islands, this time deploying a massive gunship, codenamed Orgoi. Despite the Orgoi's heavy armament, Antares managed to deal severe damage to the gunship, blowing up it's engine systems, thus making it crash into the outskirts of the Tokyo Bay area. This victory came at a cost, however: Valahian commander Nicolae Dumitrescu managed to seal a deal with the Martinez Rigel Squadron and it's leader, Milosz Sulejmani, which prompted their desertion from Martinez Security, heading south from Tokyo.

No attacks have been reported on Japan ever since.