Alkor, a young man whose childish fantasies and innocence have been betrayed by the harsh reality of life, ends up going to the flying castle where all wishes gather. There, in the search of his own wish, he ends up encountering all kinds of wishes, good or harmful ones. He meets with denizens of the Skysoul Castle, forges strong bonds of friendship, wages perilous battles against Corruptors of wishes, and above all, he makes a journey into his very own self and understands what he truly wishes for.