The Case
Conan along with Heiji, Ran, and Kogoro visit the Isle of Meerjungfrauen looking for Saori Kadowaki, who had sent a letter to Heiji asking them to save her from being killed Von a mermaid. In secret Heiji confines to Conan that the letter was meant for Shinichi despite being send to Heiji's address. But when they try to look for Saori she has been reported missing. They decided to talk with Saori's childhood friend Kimie, who is the elder's great-granddaughter. Rokuro Fukuyama the fisherman is Toshimi's fiancé. Those two along with Naoko, a Shop clerk, are also childhood Friends with Saori....