This post-apocalyptic drama takes place in the year 25 AE, when an army of lower angels has waged war against mankind. Coming out of the 25-year-long battle are newly fortified cities that protect humans who survived the war. The largest of the cities - Vega, formerly Las Vegas - sees two houses vying for control, as political upheaval and a shift in power are on the horizon. Alex, a soldier helping protect Vega's aristocracy, is watched over by archangel Michael, the only angel to turn against his kind and side with humans during the Extermination War. Alex has a secret relationship with Clair, daughter of the Lord of the City, who wants her to marry someone else to help move the city past the caste system.