This is the story of a boy named Bait who catches fish, not only ordinary fish, but monstrous fish that harm people. Because of his skills, he is proclaimed to be a hero in his town. There, he gets the infamous name, Master Bait. As he meets Nijie, an ichthyologist, they go for an adventure filled with gigantic fish, sea monsters, and a whole lot of mayhem. Get ready for a wet and wild roller coaster ride in the sea with Master Bait and Nijie.