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.

Miike Naeko of the MPD Transportation Department is concerned about the lack of development in her romantic relationship with Detective Chiba and goes to karaoke with her colleagues Yagi Shiori and Momosaki Toko to sing away her sorrows. While there, Yagi and Momosaki learn that both of them have been followed by someone recently. Momosaki sends off the drunk Naeko and her caretaker Yagi. Once she's alone, a suspicious man begins talking to her.