Yoko Okino comes to the detective agency, and Wakita Kanenori and Conan end up having to solve the case she describes that happened at a certain villa. The people present at the villa during the case had all kinds of relationships with the woman who went missing two years ago, giving all of them possible motives for killing the murder victim in the case. While attempting to solve the case based on things Yoko found strange, Conan receives a message from Kogoro, who is in the bathroom...?