The movie is set on a state-of-the art Aegis vessel with the full cooperation of Japan's real-life Ministry of Defense and Maritime Self-Defense Force. The corpse of a Self-Defense Force member has been found — minus the left arm — and a spy has infiltrated the Aegis vessel. The heroine Ran is put in jeopardy, and Conan is forced to stand up against the dangerous Spy "X."
The man who claims is Yuuki Amemiya's father actually isn't and is Spy X. Sausaura's death was an accident. He slipped into the ocean and drowned after being chased by Masaaki Kurata, who thought he was someone suspicious.