Sound of the Sky

is a Japanese anime television series produced by A-1 Pictures and Aniplex and directed by Mamoru Kanbe. The 12-episode anime aired in Japan on the TV Tokyo television network between January 5 and March 22, 2010. So Ra No Wo To is the debut project of Anime no Chikara, a joint project of TV Tokyo's anime department and Aniplex. A manga adaptation illustrated by Yagi Shinba began serialization in the January 2010 issue of ASCII Media Works' Dengeki Daioh magazine. A visual novel developed by Compile Heart will be released on the PlayStation Portable in May 2010.

Plot
So Ra No Wo To revolves around a young girl named Kanata Sorami who is inspired to join the military after witnessing a rendition of Amazing Grace by a mysterious trumpeter of the Helvetian Army. Becoming a bugler, she is assigned to the 1121st Platoon stationed in the town of Seize (inspired by Cuenca, Spain) in Helvetia (another name for Switzerland), where she is taken into the care of 2nd Lt. Filicia Heideman, M/Sgt. Rio Kazumiya and the rest of the 1121st Platoon. The story takes place in a post-apocalyptic world after a great war regressed humanity's technological capabilities back to early-to-mid 20th century standards.