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

Two escaped criminals who kidnapped a baby break into the house of Misawa, a man who works in an advertising agency and lives quietly with his family. They will force him to collect the child's ransom for them.