Wooden fishing boats keep washing up on Japan's western coast, some carrying decomposed bodies, others empty and battered beyond recognition. Locals in coastal towns have taken to calling them ghost ships, and the film follows the fishermen, coast guard officials, and researchers trying to explain where the vessels come from and why the numbers have climbed sharply in recent years. The trail points toward North Korea, where a state push for bigger catches has sent poorly equipped crews further out to sea than their boats or fuel supplies can handle, often with fatal results. Interviews with Japanese residents describe the discoveries firsthand, from skeletal remains in the hull to Korean-language markings on the wreckage, while officials weigh the political sensitivity of a phenomenon tied directly to conditions inside a closed country. The film stays close to the coastline and the people dealing with the wreckage rather than speculating beyond what the evidence shows, building a picture of a humanitarian crisis playing out quietly on the water.