Kogoro is asked to open the Tokyo Spirits versus Ganba Osaka game, so he brings Conan and his friends with him to the stadium. However, Kogoro becomes a laughingstock when he becomes sick during the opening ceremony. Afterwards, a doctor diagnoses him with diarrhea, which Conan believes was caused by the sports drink Kogoro drank. Apparently the drink was meant for Tokyo Spirits player Akagi. When Conan and Haibara examine the bottle Kogoro drank out of, they make a surprising discovery, but...