Tập 1: Vào ngày sinh nhật thứ 16, Percival nghe ông nội Vargis kể về thế giới bên ngoài.

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Percival, a boy who lives in the secluded paradise place "The Finger of God." On the day he turned 16, Percival heard "Tales from the Outside World" by his grandfather Vargis, and his desire for adventure grew, but he could not leave Vargis alone and repressed his feelings. There was... At that moment, one of the legends appears before Percival, "a knight who controls a ghost ship that sails through the sky."