Bourbon and Conan help with the investigation and arrive to the conclusion that the culprit must have switched her cup with the victim in order to poison her. There is one problem though: each one of them is drinking a tea of a different color.

Shinichi helps the police to solve the murder case. As an apology for what happens, he promises Ran that he will take her to the the new amusement park, Tropical Land, if she wins the next karate tournament.