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Claus Valca is from the world of Prester where he and his long-time friend, Lavie Head live and work as sky couriers. They pilot a van-ship left to Claus by his father. Together they dream of one day making the journey their fathers were never able to complete — fly across the notoriously dangerous stretch of space known as the Grand Stream.
One day, after Claus and Lavie agree to shuttle a mysterious girl named Alvis Hamilton to the air-battleship, Silvana, they become involved in a war that shakes their world — Prester, a world where mighty winds and a sea of clouds spread far and wide...