Conan stumbling into a mystery that mirrors his own Detective Boys but with the roles reversed, he's the adult now, they're the desperate ones, creates an uncomfortable echo that the OVA actually leans into. The missing kid isn't a puzzle to solve for fun; it's a reminder that Conan's trapped in a child's body watching real children face real danger. A single episode that does more to expose the cost of Conan's situation than a dozen case-of-the-week episodes ever could.
Conan's trip to Osaka takes an unexpected turn when he and Ran stumble upon three kids who bear an uncanny resemblance to his classmates from Tokyo. These children are frantic about a missing friend, and despite being far from home, Conan can't ignore a case. What starts as a simple favor becomes something more complicated as he digs into the circumstances surrounding the boy's disappearance. Working alongside Heiji, who knows Osaka's streets far better than any outsider, Conan has to piece together clues while navigating unfamiliar territory. The mystery deepens as details don't quite add up, and the fear in the children's eyes suggests this is no ordinary runaway situation. With Ran and Kazuha offering support, Conan races against time to find answers before it's too late. The case forces him to think on his feet and adapt his usual methods to this new environment, all while questioning whether he's really dealing with what the surface evidence suggests.