Set in the future on a land that, after being marred by long-lasting wars, has settled into a quiet cycle of decline. Sorami Kanata is a 15-year-old girl who fulfills her dream of enlisting in the army and joins a unit of five girls who protect a fortress that looms over a little village. The girls also play music that reverberates across the skies over towns without people and seas without fish.

[Source: AniDB]

Two extra episodes included in the Blu-ray and DVD volumes 4 and 7 of "Sora no Woto".

The first, episode 7.5, takes place during the series. Felicia proposes a mock battle between the maidens after Kanata sees Rio opening the door to the distillery. If Kanata can win, they'll tell her the truth about the secret room. However, things get out of hand when alcohol gets involved!

The second, episode 13, takes place after the series ends. One of the local children asks Kanata what her dream is. Unable to answer, Kanata talks to the other characters about their dreams and goals.