The movie is set on a state-of-the art Aegis vessel, "Hotaka", 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."
Sasaura's death was an accident. He slipped into the ocean and drowned after being chased by Masaaki Kurata, who thought he was someone suspicious. After Kurata is arrested, Yuki reunites with his real father. Fuji asks Conan who he really is, but Conan simply replies he is just an elementary school student.
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Trivia
'Private Eye in the Distant Sea' is currently the highest grossing film in the Detective Conan franchise grossing up to 3,509,406,150 yen.