The Aegis Destroyer warship is carrying out public drills in Maizuru Bay, where a suspicious foreign vessel had just been sighted. Conan Edogawa, Ran Mouri, Kogorou Mouri, Sonoko Suzuki, and the Detective Boys all received invitations to attend. Yet during the ongoing naval exercises, a crew member discovered a lieutenant's severed left arm. Later, Conan realized a foreign spy might have infiltrated the vessel to steal top‑secret data by any means. If that information leaked, Japan's defensive line would be compromised, exposing the nation to hostile attacks. With maritime police assistance and allies on land investigating, Conan must now avert this national emergency and uncover the infiltrator for Japan's safety. He must coordinate with naval intelligence, secure the ship's communications, and trace the spy's trail before the threat escalates to protect the homeland.
TMS Japan