Hitorie performs the opening theme song "3-bun 29-byō" (3 Minutes 29 Seconds), and SawanoHiroyuki[nZk]:mizuki will performs the ending theme song "Avid." Yen Press is publishing the light novel series in English, and it describes the story: The Republic of San Magnolia has been attacked by its neighbor, the Empire. Outside the 85 districts of the Republic there is the 'non-existent 86th district,' where young men and women continue to fight. Sheen directs the actions of young suicide bombers, while Lena is a “curator” who commands a detachment from a remote rear. The story of the tragic struggle between these two begins!