A shy teenage boy's inability to say no is tested when a headstrong girl drags him on a mystical journey amid summer snow to find her missing mom.

The Straw Hats visits an island, known as Mecha Island, where a fisherman sings an old folk song about a Golden Crown. Searching for that mysterious treasure, they find a hidden entrance into the island. The island's leader, Ratchet, impressed with the find and in search of the Golden Crown himself, invites the crew to join him in his search and the crew along with Ratchet and his henchmen enter the cave. As it turns out, the islands true form, is that of a giant turtle. Ratchet, who had known this all along, uses his mechanical castle to take control of the turtle, in order to use it, to take over the world. Now the Straw Hats have to stop not only Ratchet, but also the helpless turtle, from crashing into a nearby island.

Action Kamen comes to Shinchan's world seeking help from Shinchan to defeat the Haigure Demon. Then the adventure of Shinchan and his family begins.

Facing the destruction of her planet's natural resources, warrior princess Nausicaa rallies her people against an evil queen's rampaging army.