A message has arrived from Kid the Phantom Thief, that he will steal a Japanese sword belonging to wealthy Onoe Family in Hakodate, Hokkaido. Conan and Heiji Hattori, who happened to be in Hakodate, are on the case to capture Kid. Coincidentally the family lawyer of Onoe is found murdered in the warehouse district, apparently slaughtered by a Japanese sword. The suspect is an investor/arms dealer who is said to be after Onoe family’s hidden treasure. In the North among cherry blossoms, the exciting hunt for treasure begins!

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