As the newly-appointed Warden-Commander of Ferelden, you are tasked with rebuilding The Order of the Grey Wardens in the region, based around the ancient fortress of Vigil's Keep. The story starts about half a year after the Fifth Blight had been vanquished in Ferelden.
If you don't import an old save, you start with a brand-new main character, too - a seasoned Grey Warden from the neighboring Orlais. Although you can import your Origins Player Character to Awakening, it stars a mostly brand-new supporting cast and is set in a region of Ferelden that was never visited in the original campaign. While continuing and expanding the Origins storyline, its plot is mostly independent of the original campaign. Awakening is a 2010 Expansion Pack for the successful 2009 RPG Dragon Age: Origins and thus part 1.5 of the Dragon Age series.