In 1803, fishermen on Japan’s Hitachi coast spotted something round and unfamiliar drifting offshore. They hauled the hollow vessel onto the beach—and discovered a mysterious young woman inside.

Step into the story as one of those fishermen. Examine the vessel’s clouded windows and iron-plated hull, hear the woman speak in a language no one understands, and watch as she fiercely protects a box she refuses to surrender. Who was she, what was hidden inside—and why did the villagers send her back out to sea?

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