We open with an alt-history voiceover.
In 2010 (slightly into the future when this was released,) the Holy Empire of Britannia (shown as all of North America on the map,) declared war on Japan.
Their war Mechs, the Knighmare Frames, defeated Japan's conventional forces.
Japan is know conquered territory, denied even its own name, it is simply known as Area 11.
A young boy swears that he's going to destroy Britannia.
A conventional opening follows: action shots of a large number of characters.
Opening subtitles move the timeline up to 2017.