Kogoro, Ran, and Conan are walking down a deserted street when the request is over, and they hear the sound of horns and screams. There, they find Goro Nezu, a security guard who has been stabbed in the stomach with a knife. Pointing at the main street, Nezu says "white clothes" and dies. In addition, on the stairs where Nezu seems to have fallen, there is a screaming Keiko Yuki and the bodies of her husband Hideto Yuki, the president of an IT company. When Conan heads down the main street to hunt down the criminal, he finds a young man in a "black suit".