A house where a classmate of the Detective Boys' lives is burned down and the arsonist, one of the three tenants, is identified in a diary only as "Yellow Man".
With the Yellow Man mystery solved, Subaru Okiya, the new resident of Shinichi's old house, meets Ran and Sonoko. Meanwhile, Conan takes an interest in a case involving paper airplanes with strange markings on them.
When both Subaru and Conan figure out that the paper airplanes are an SOS from someone who is being held captive, Ran and Sonoko hold a little competition between them to see which of them finds the prisoner first.
A TV manager making a show about Kogoro is found poisoned in his locked apartment and Conan realizes that their companion, a TV producer, is hiding something very dark.
