Hetalia Axis Powers Movie: Paint it, White

Aliens from the planet Pict invade Earth with a bizarre weapon: anyone they capture is transformed into a blank, white, featureless being called a Noppera. The world’s nations attempt to fight back separately and fail one after another.

With individuality itself being erased, the Axis and Allied countries have no choice but to cooperate. Italy, Germany, Japan, America, England, France, Russia, China, and their companions must somehow combine their incompatible habits and national pride into one plan before the Picts paint the entire planet white.