Melonpanna and Rollpanna, two sisters who live apart, each become friends with Marin, a mysterious horse. Marin shares her treasure with Rollpanna: a sunken ship that she brings up from the bottom of the sea. Baikinman witnesses this and decides to build a ghost ship of his own, with Dr. Hiyari helping him. He also schemes to push Rollpanna completely over to evil so he can use her against Anpanman. A comic fantasy film set in the Anpanman world.