In a world where massive airships and flying contraptions dominate the skies, a young boy named Pazu discovers a mysterious girl named Sheeta drifting down from the sky, held aloft by a glowing pendant. Sheeta is being hunted both by government agents led by the secretive Muska and by sky pirates commanded by the indomitable Dola. Together, Pazu and Sheeta seek to unravel the secrets of her magical pendant, which seems to be connected to the mythical floating city of Laputa, believed to be the last remnant of an advanced civilization.

As they embark on their journey, they brave numerous adversities, from treacherous landscapes to aerial battles. Along the way, they discover that Laputa holds not only immense technological power but also an ancient and potentially destructive secret. Sheeta and Pazu's bond grows as they learn about the responsibilities tied to such power and what it means for humanity. Their quest becomes a race against time, with their choices poised to redefine the world's future.