The separated sisters Melonpanna and Rollpanna both befriend a mysterious horse Marin. She shows Rollpanna her treasure, a sunken ship she raises from the depths. Baikinman sees this and is inspired to build a ghost ship of his own with help from Dr. Hiyari. He also plots to turn Rollpanna fully evil in order to use her to defeat Anpanman.

Source: ANN

Note: Double Feature with Anpanman to Happy Otanjoubi

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Parent story: Sore Ike! Anpanman
Other: Anpanman to Happy Otanjoubi