Conan deduces that the "locked" door was a trick involving a cassette tape and a heavy dictionary.
He identifies one of the professor's students, Akira Shirakura , as the killer. Shirakura had murdered the professor to prevent the release of incriminating photos and tried to stage the scene as an accident. The Bitter Aftermath Detective Conan (Dub) Episode 129
While the murder is solved, the victory is hollow. In the chaos of the investigation, the floppy disk containing the drug data is accidentally formatted or lost, destroying Conan’s immediate hope for a cure. Conan deduces that the "locked" door was a
The episode concludes with a haunting moment: Haibara breaks down in tears, confronting Conan about why he couldn't save her sister, Akemi, despite his great detective skills. This emotional climax cements Haibara as a permanent, tragic ally in Conan's fight against the Black Organization. The Bitter Aftermath While the murder is solved,
In the English dub of Detective Conan (Case Closed), is titled "The Girl from Black Organization and the University Professor Murder Case" . This pivotal episode marks the first appearance of Ai Haibara , a character who fundamentally changes the trajectory of the series . The Mysterious New Student
Haibara reveals that a floppy disk containing crucial data about the drug—and potentially a cure—might be hidden at the home of , a university teacher she once stayed with. Conan, sensing a chance to regain his true form, rushes with Haibara and Professor Agasa to the professor's house. The Murder Case
She explains that she is the creator of , the very poison that shrunk Shinichi Kudo. After the Organization murdered her sister, Akemi, Shiho took the drug herself to commit suicide but instead shrunk in size, eventually seeking out Shinichi (Conan) for help. The Search for the Disk