When Conan and Kogoro follow Ran because she's unusually excited, they see her meeting Sonoko and Sera at a café. They're planning a trip to Kyoto together. Later, waiter Saraie is clubbed to death with a large vase in the changing room of the café. Customer Motosu's restaurant was heavily criticized by Saraie on his food blog. Waitress Isuzu was being harassed by Saraie's romantic advances. The manager Tamao previously dated Saraie. All three have motive to murder Saraie, but none of them are able to swing the vase used to kill him...

Kogoro, Conan, and Ran's rental car runs out of gas, so they have college student Saeki tow them to a nearby supermarket with his van. Saeki and his classmates Haruka and Tamada leave their drunk professor Goto in the back stea while they go shopping. Later, the students discover Goto dead inside the car. Goto wore his cell phone on a strap around his neck, which strangled him when he slid down in his seat. Inspector Megure believes it was an accident, but Conan finds something strange about the case...