Conan joins Ran and Kogoro on a trip to Kanazawa that Ran won in a lottery. While enjoying Kanzawa, they meet a woman named Mari who is behaving suspiciously. It turns out that she is a wealthy young lady disconnected from the real world. They decide to help Mari and later discover that she is involved in a criminal case. Furthermore, they all get caught up in the case as it moves in an unexpected direction.