Kogoro, Conan, and Ran arrive at a restaurant with a sitting room looking out on a river. The watermill upstream catches Conan's eye. Later, they meet Teito University students Juri, Maria, and Yuko, who ask Kogoro for feedback on the photos they've been taking to submit to a photo contest. All three leave the restaurant for one reason or another, but only Maria and Juri return. Just as they are wondering where Yuko went, they see a body floating down the river amidst the blood red water...