A girl on a small island in the South Sea was accidentally swept into the seabed while helping a sea turtle untie the fishing net that bound it. She entered the Ocean Academy to learn about the ocean while looking for a way to return to the human world. She met Sora, who was raised by dugongs, and the oceanographer Jinghai, and became a partner. Together they saw huge marine creatures, suffocating darkness and ancient legends.
Concept: water-like