Plot: Kogoro receives a letter from a mysterious person named Kurataya Komakichi claiming he wants to give him his family treasure, so he heads to Yamaguchi prefecture with Conan and Ran, but he's mistaken for a robber's accomplice and is arrested. Komakichi is the name of a robber who shot owner of Japanese-style cafe Takarada in the arm and stole millions of yen worth of Keicho gold coins