Ever since his father departed, Gran has yearned to seek out Estalucia, the mystical island in the sky. His adventure kicks off when he encounters Lyria, a mysterious girl pursued by the Imperial Army. However, as Gran tries to save her, a series of unexpected events unfolds, culminating in a remarkable act that ties Gran and Lyria's destinies together for good. Now, Gran and his friend Vyrn must battle to safeguard Lyria...and make their way to the edge of the sky!