While Liam was collecting electric fish around the island, a mysterious girl, Maria, fell from the sky...Maria is surprised by the way the people live on the island, but where on earth did she come from and what is her purpose...?In order to unravel the mysteries of the cloud-covered world and meet his "younger brother" once again, Liam aims for the "Top of the Cloud King"!! The great adventure that shakes the sea of clouds has begun!!