Proof of the Man

Kyōko killed Johnny Hayward because he was her mixed-race son born from her postwar prostitution. After becoming a successful fashion designer, she was desperate to hide her past and maintain her reputation. When Johnny came to Japan, she saw him as a threat to everything she had built and murdered him to protect her secret.

Earlier, Munesue notes that Kyōko seems to know more about the murder than she reveals, hinting at her hidden connection to the victim.

"Straw hat" was Johnny Hayward's dying clue, referring to the watch left at the scene of Naomi's accident. The watch belonged to Kyōko's son, who accidentally ran over Naomi. The watch band was made of straw-colored leather, linking the two crime scenes together.

The timeline shows that Naomi's accident and the watch left behind occur concurrently with Johnny's murder, creating the hidden connection.

Johnny Hayward was Kyōko Yasugi's biological son. She had been a prostitute in the postwar years and bore a child with a Black American soldier. She gave the child up for adoption, and he grew up in New York as Johnny Hayward. When he arrived in Tokyo seeking his mother, Kyōko murdered him to hide her past.

Munesue discovers in New York that Johnny was the son of a Black American soldier and a Japanese woman, setting up the revelation of Kyōko's connection.

Shuftan was the American detective who worked with Munesue in New York. The film reveals that Shuftan appears to be the same man who killed Munesue's father, though the exact circumstances are not fully detailed in the summary. This personal connection adds complexity to their partnership.

Munesue is partnered with Shuftan despite his suspicions, suggesting an underlying tension from their shared history.

Naomi was having an extramarital affair when she was accidentally run over by Kyōko's son. Panicking, he and his girlfriend dumped her body in the sea, leaving behind his watch at the scene. This watch became a crucial clue that linked him to Johnny's murder through the "straw hat" dying word.

The timeline shows Naomi's accident occurring concurrently with Johnny's murder, creating parallel threads of crime and concealment.

After accidentally killing Naomi, Kyōko's son confessed to his mother about the accident. Kyōko advised him to flee to New York with his girlfriend to escape police investigation. This decision also created the opportunity for the confrontation in New York between Munesue and Yasugi's son.

Kyōko's suggestion reveals her priority on protecting her family name, even helping a murderer escape justice.

After Munesue confronted Kyōko with the truth about Johnny being her son and her responsibility for his murder, she was overwhelmed by guilt and could not face the consequences. The revelation that she had killed her own child to protect her reputation proved too much to bear, leading her to take her own life.

Munesue's investigation progressively tightens around Kyōko, culminating in the direct confrontation that exposes her crime.

In America, Shuftan investigated Johnny's background and discovered that Johnny's father, the Black American soldier who had fathered Johnny with Kyōko, was already dead. This ended one potential investigative lead and deepened the tragedy surrounding Johnny's origins.

This discovery removes the possibility of Johnny reuniting with his biological father, adding to the film's bleak tone.

In New York, Munesue encounters Yasugi's son, who deliberately provoked American detective Shuftan into shooting him dead. This appears to be a deliberate act, possibly out of guilt over Naomi's death or to avoid facing justice. His actions lead to his own death at Shuftan's hands.

The timeline shows this fatal confrontation occurs during Munesue's New York investigation, creating a violent climax to the cross-border thread.

After learning that Johnny's father was already dead, Shuftan continued his investigation in America but was stabbed and died. His death mirrors Johnny's own stabbing at the beginning of the film, creating a tragic parallel and leaving the case with unresolved questions.

Shuftan's violent end mirrors Johnny's murder, emphasizing the film's theme of cyclical violence and unresolved justice.

Munesue grew suspicious of Kyōko because she knew more about the murder than she revealed. Her fashion show coincided with Johnny's killing in the same hotel, and her reactions seemed unnatural. His investigation gradually uncovered her hidden connection to the victim and her desperate need to protect her reputation.

The timeline notes Munesue's suspicion grows after the Tokyo murder, leading to his decision to travel to New York.