Conan and his friends visit a campground with their assistant homeroom teacher Wakasa where they meet Shiraami University basketball team members Ashizawa, Urushibara, Danno, and Midori. Danno is the former ace whose eye was damaged when Urushibara hit him with his elbow during practice. Urushibara gets into an argument with Danno and Ashizawa, creating an awkward atmosphere. The sullen Urushibara says he's going to drink and go to sleep and heads to his tent alone. Danno, Ashizawa, and Midori each take turns going to get Urushibara, but he refuses to come out. Later, Genta notices Urushibara's tent burning...

Inspector Megure asks Kogoro to help him solve the case of Japanese literature scholar Reigan's murder at his home in Yotsubadai. The day before Reigan's nephew Maihama was to go to trial, he claimed he was committing a burglary in Sasago-cho when Reigan was murdered.