In 2010 a.t.b., the Holy Britannian Empire, while continuing its longstanding conflict with the E.U., suddenly invaded the eastern nation of Japan and renamed it Area 11. As a result of this, the Japanese in all other parts of the world were given the fate of exiles as Elevens as well. After seven years, the continuously disadvantaged E.U. army gathers Elevens that are not formal citizens and establishes the “W-0” Unit for the sake of facing the enemy in dangerous operations with extremely low survival rates.