At the Edge of Darkness The 'Margot Langer' impostor tries to blackmail Johan. Dr. Tenma helps a young 'doctor' at an illegal clinic Details Casts Title At the Edge of Darkness Genres Animation Drama Crime Mystery Release Date 2004-12-08 Episode Runtime 00 Hours 24 Minutes Season Number 1 Episode Number 34 Production Companies Shogakukan Production, Madhouse, VAP Hidenobu Kiuchi Tenma (voice) Nozomu Sasaki Johan Liebert(voice) Mamiko Noto Nina Verdona(voice) Tsutomu Isobe Lunk(voice)