AnimeWai: Sora no Woto

After a cease-fire during a long war. A second-class Bugler soldier, Kanata Sorami, is reasigned to her new outpost to a stronghold Fortress in the little city of Seize, where other female soldiers reside to serve in a multi purpose task, 1st: maintain the fortress, 2nd: contribute to the traditions of the city since all are young females and the folklore tales that the young maidens keept a demon under control, and 3rd: also to be prepared in case of a non probable attack due to the isolation of the city.