Based on the popular story of Princess Tamatori and the sacred jewel, inspired by the work of Kuniyoshi Utagawa. The Tang emperor presented a sacred jewel as a gift to his father-in-law, Fujiwara no Kamatari. A storm wrecked the ship that was delivering the offering, and the jewel sank to the Dragon Palace in the depths below. In the hope of retrieving the lost jewel, Kamatari’s son Fuhito marries the young Ama (female pearl diver), who dives into the sea to retrieve the precious jewel. As the Dragon King’s court chases the diver, she cuts open her breast to hide the jewel. Though she saves the jewel, dies from her wounds when she returns to shore. This is a story of strength, knife in hand a fearless woman who faces a whole army of sea creatures and their king, without giving in to her determination.