During a rainy day, the Detective Boys stumble upon a murder but are unable to catch the culprit due to traffic. Left with a lone clue from a dying detective, Conan Edogawa finds himself embroiled in a series of murders that shake the police force. With suspicion cast on the police themselves, an intense hunt begins for the killer among their ranks. Despite their efforts, another attack occurs, leaving Ran Mouri with amnesia and a deep fear for her safety. As Ran struggles to recall her past, Conan must race against time to unravel the mystery and prevent further tragedy.