(Case Closed), originally aired in Japan on May 3, 1999. This anime-original episode features Conan solving the murder of astronomer Koichi Nonaka, which was staged to look like an accident by perpetrator Hiroshi Akimoto. Detailed information on the case, including the "perfect" alibi trick used by the culprit, can be found on Detective Conan World
, titled " The Suspicious Astronomical Observation " (疑惑の天体観測, Giwaku no Tentaikansoku ), is a standalone anime-original (filler) episode that first aired in Japan on May 3, 1999 . While it does not advance the overarching plot involving the Black Organization, it is often remembered for its clever use of astronomical timing and a deceptive "visual trick" to create a seemingly airtight alibi. Episode Overview and Production Original Airdate: May 3, 1999 Detective Conan Episode 143