Big 1 is a white sperm whale with a body as huge as an iceberg and wisdom that surpasses humans. Ryujinmaru crew member Kenji Shiratori and gunner Takeru Ogami, who are filled with fighting spirit against the gigantic creature known as the "White Devil," eventually work together with the giant whale to defeat the Black Flag Fleet, which is plotting to conquer the world's oceans, and protect peace. A romantic marine drama based on Melville's masterpiece "Moby Dick."