In a world where people have forgotten how to make wishes, the stars are slowly disappearing from the night sky. Lumi, a tiny star spirit, sets out on a journey and encounters a cloud child who cannot stop crying and a single flower that is beginning to wither. Before long, Lumi discovers the final wishing star left in the world—and must make an important choice. Should Lumi use its light to fulfill a personal wish? Or should that final wish be given to someone else?