Two episode story arc. Ran, Conan, and Sonoko are at a skating rink popular for it's fireworks show. Shortly after arriving, they meet a group of skeet shooters who argue about "that incident last year." Right before the show is about to start, they all disappear to use the bathroom or get something to eat. Sonoko also headed to the bathroom, which had a "closed for repairs" sign. When the fireworks start they have almost all returned, but Sonoko is still waiting for the bathroom when a mysterious figure runs out. She enters the bathroom to find one member of the group dead.