Ep. 1: Wil and Allison embark on an adventure after meeting a mysterious old man.

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Set in a world divided by mountains and a river, Roxche and Sou Beil have fought for 130 years, with a ten-year armistice currently in place. Wil, a Roxche student with a photographic memory, enjoys a summer break at his dormitory. His friend Allison, an Air Force pilot, arrives in a biplane after six months apart. They ride Wil’s motorcycle and encounter an old man on a bridge known for fabricating tales. After giving him a ride, he claims a treasure in Sou Beil could end the war. A man from the town hall abruptly takes the old man away, but Wil suspects deception. Allison and Wil pursue them, discovering the old man was taken in a large plane. Determined to uncover the truth, they steal an aircraft to follow their captors.