When a calling card belonging to the legendary Kid the Phantom Thief is found in an illustrious family's warehouse in Hokkaido, Conan's interest is piqued: why has a great thief well-known for his pursuit of precious gems set his eyes on swords dating back to the great Edo period? Meanwhile, the discovery of a body with a cross slashed across its chest leads to the "Merchant of Death", an arms dealer who has his eyes set on an even greater treasure. With Conan and his fellow detective Heiji Hattori both hot on his trail, the battle for treasure begins!