As a result of Yugo’s determined efforts, Kuno from the 1st Investigation Unit is arrested. However, Kuno tells Akagi that there remains another betrayer. Meanwhile, Keigo begins to wonder who is supporting Yugo with all of this. A breathtaking finale awaits.

Keigo begins his independent investigation, after feeling a sense of doubt regarding one of the apparent suicides. Meanwhile, Minagawa and Yugo are finally getting to grips with the main case.

It turns out that Kosaku Minagawa was the one who saved Yugo, after he gets knocked down by a car and injuring himself, whilst pursuing a man who hold vital clues to the case. Why was Minagawa around Yugo at the time!? The answers for the case, gradually gets uncovered.

When the cops manage to confirm the existence of Yugo, linking him to the murder case, accusations against Keigo begins to unwind. But, what will Keigo do after he witnesses Yugo with Satomi?

Yugo finally shows himself in front of Keigo, as he comes out about the kidnapping incident. "There is another kidnapper. I will attack with my bare hands." Yugo then starts to talk about the incident 20 years back.

Keigo receives a sudden arrest warrant, for possible connections with the murder of a suspect linked with the kidnapping incident 20 years ago. This in fact turns out to be a manipulative trap by his twin brother.

Yugo who was kidnapped 20 years ago had been alive all this time. Meanwhile, his twin brother Keigo becomes the subject of suspicion as a man is suddenly murdered.

The main characters Keigo and Yugo have the same gene information, but one is a criminal and the other is a detective.