The main character is Shinya Oda, a high school student living on a small island in Hokkaido. He is a member of the scuba diving club, and he is working in the construction of an undersea aquarium. A strange whale-like creature that is trapped in the aquarium is communicating with Shinya through telepathy, even though he does not understand what it is saying. The main character meets the love interest (a fellow scuba diving club member) in the episode, and we also see the main character overcoming various obstacles.