A noir drama depicting the downfall of a veteran detective who hates evil and falls into its depths. Ace detective Sugai (Oki Minoru) pursues Chiyo (Hara Chisako), the mistress of a man who was arrested for extortion, and takes advantage of her weakness. However, as his colleague Tokumochi (Hisashi Igawa) and others regard him with suspicion, he is tormented by remorse.