Why would a game like that even need a story?
Usually it's basically Star Wars: a big bad Empire makes a superweapon and it's up to a plucky little democracy/coalition/rebel group to defeat it with fighters.
That said, the idea of a continent collaborating to build a ring of absolutely COLOSSAL railguns firing seemingly nuclear shells to intercept an asteroid, and then one nation seizes it and uses it to get air supremacy over most of the continent, is pretty damn cool.
In any
Ace Combat game, there are two stories going at once.
The big story is the story of the war itself, whatever war that happens to be. That's what
@Phrossack is talking about. Most of the wars in the
Ace Combat games have their roots in two things: the superweapons created to destroy the Ulysses 1994XF04 asteroid and the fallout of their failure to
completely destroy it. The asteroid fragments killed millions and caused famines and economic catastrophes in countries like Erusea and Belka, which brought aggressive military regimes to power that promptly began wars; other wars come from the conspiracies and machinations of the losers in those conflicts to try to take revenge on the winners. And in those wars, the superweapons were turned on the rest of the world: the Stonehenge cannons, the Excalibur laser, the Chandelier railgun, and so on.
The other story is the human element, which dominates the cutscenes before the missions and attempts to ground the high-flying air missions with emotional stories. In
Ace Combat 4, we see the war through the eyes of an orphaned boy in occupied San Salvacion who becomes a sort of squadron mascot for the Erusean elite fighter squadron that opposes the main character. In
Ace Combat 5, the perspective shifts to the other pilots in the main character's flight element as they undergo high drama and unravel a conspiracy to pit the world's superpowers against each other. In
Ace Combat Zero, the secondary storyline is of a documentarian following the actions of the greatest ace of the Belkan War - the sort of ur-catastrophe of the
Ace Combat setting - and his interviews with the pilots that that ace shot down, in an effort to get at what really makes a military legend.
Ace Combat 6's secondary story was a sprawling mess with about a zillion different characters, and it was super...uh...memey for lack of a better word: the women trying to traverse the country to find their loved ones, the tank crew that does a less-likable (and way less-funny) version of
Kelly's Heroes, the ace enemy pilot with no personality, the obnoxious wingman, and so on.
Apparently, the secondary storyline in
Ace Combat 7, while definitely not as understated as the one in
AC4, is significantly less memey than the last one, so I'm down.