It all started when Ran Mori lost her smartphone. Shinichi Kudo, her would-be boyfriend, promises to replace it, but the high schooler is already making his name as a consulting detective for the police; when he abruptly leaves her karate tournament to skillfully solve a high-society murder case, Shinichi's going to have a take Ran on a special date to get back on her good side. A colorful amusement park beckons-- and so does a horrifying act of homicide!