Liam, a boy living on a small island, is occupied with collecting electric fish from the surrounding waters when a mysterious girl named Maria suddenly falls out of the sky. Maria is perplexed by the island's way of life and speaks of a world shrouded in cloud cover. Her arrival sets Liam on a grand adventure to uncover the secrets of this cloud-enveloped realm. His personal goal is to reach the Top of the Cloud King, a legendary summit that he believes will allow him to reunite with his younger brother. As Liam and Maria journey through floating islands and navigate the dangers of the sea of clouds, they encounter other inhabitants and pieces of a larger puzzle involving the mysterious nature of their world. The story blends exploration, personal longing, and a deepening mystery about why the sky is sealed off by clouds.