A message has been received from Kid the Phantom Thief, announcing his intention to steal a Japanese sword owned by the affluent Onoe Family in Hakodate, Hokkaido. Conan and Heiji Hattori, who are coincidentally in Hakodate, take on the challenge of apprehending Kid. Meanwhile, the Onoe family’s lawyer is discovered dead in the warehouse district, seemingly killed with a Japanese sword. The prime suspect is an investor and arms dealer rumored to be seeking the Onoe family’s secret treasure. Amidst the cherry blossoms in the North, an exhilarating treasure hunt unfolds!