Advance Wars (Nintendo Cinematic Universe)

Advance Wars is a Japanese anime series.

Season 1
War rages across Cosmo Land, and Orange Star seeks to end it.

Season 1

 * The nation of Orange Star in at war against the neighboring nation of Blue Moon, with Olaf as the Blue Moon Army commanding officer (CO). Olaf suddenly ordered an invasion of the Orange Star nation and is in battle with the Orange Star Army.
 * Nell, the de facto leader of the Orange Star COs, gives Andy the duty of a tactical advisor for the Orange Star Army.
 * After winning a battle against Green Earth, Andy gets mysteriously accused by Green Earth's CO, Eagle, of committing a treacherous act of aggression against Green Earth.
 * After defeating the Blue Moon troops that invaded the Orange Star country, the Orange Star Army then invade the Blue Moon country, defeating their troops. The Blue Moon COs, Olaf and Grit, are revealed to be COs who both used to work for the Orange Star Army, but switched to Blue Moon.
 * When the Orange Star Army's intention was to just pass through the other two countries, Green Earth and Yellow Comet, the countries' COs like Kanbei of Yellow Comet assume a threat of an invasion and declare battles against the Orange Star Army in their land.
 * Later on, Green Earth CO Drake tells Eagle that the Orange Star Army didn't attack Green Earth, saying that "This entire conflict has been orchestrated from the beginning."
 * Meanwhile, Yellow Comet CO Sonja and Grit try to discover the person who is really behind the attacks.
 * When Eagle meets Andy again, Eagle again accuses Andy of attacking Green Earth, to which the Orange Star COs eventually convince Eagle that it wasn't Andy who attacked Green Earth. This explains why the three nations have been declaring battles against Orange Star, as they thought Andy attacked them first.
 * When Eagle meets Sonja, Sonja also tells Eagle that Andy wasn't behind the attacks, saying it was someone else, and goes with her to see what she discovered. It is revealed that the enigmatic Black Hole Army, under the command of Sturm, is the true enemy. Using a CO doppelganger clone of Andy, Sturm stirred up war among the four countries in order to confuse, weaken, and eventually conquer them.
 * Once this is revealed, the four countries unite to drive Black Hole out of their land, the Cosmo Land, with COs automatically chosen depending on the paths the player took during the game.

Season 1

 * Based on Advance Wars.