Adapted from the novel Nagisa no Firefly by Izumi Sakagami.The story takes place on Ryukyu Island (Okinawa) before the Return Agreement takes effect.In the spring of 1972, Taichi Makita (played by Issey Takahashi), a detective assigned to the Metropolitan Police Department, returned to the Ryukyu Police Headquarters.

As soon as he took office, he encountered a major case in which a cash transport truck used to recycle U.S. dollars on the island was attacked, and US$1 million was stolen from the vehicle.Can Mahoda successfully solve this robbery case and capture the dollar thief lurking on the island?

In 1972, in Okinawa, which was about to return to its homeland, a cash transport truck containing $1 million in banknotes was attacked and disappeared.Mahoda (played by Issey Takahashi) of the Ryukyu Police Special Countermeasures Room, who is in charge of the secret investigation, together with his colleagues Yonaha (played by Takashi Aoki) and experienced Tamaki (played by Kaoru Kobayashi) and others began to track down the robbers.

The time limit for resolving the incident is 18 days after returning to the homeland.The fate of Okinawa is at stake, and a brutal search begins that involves Okinawa's financial circles, local gangs, and even people related to the U.S. military.

Mahoda and Shinsato (played by Chifeng Kiyoshima) heard what happened from the returning bank clerk. They were surprised by these testimonies and began to investigate the surrounding situation.Then, it was found out that the incident was related to the high-end salon “Southern Cross”...

On the other hand, Yonaha tracks the whereabouts of the local gang and finds a woman who is closely related to Miyazato (Riku Kajima).As the search progressed, CID (U.S. Army Criminal Investigation Service) Captain Chizawa (played by Yu Shirota), who smelled the movements of the Special Countermeasures Room, called Maoeda out, and the two finally began to confront each other.

Someone is killing the prostitutes of Koza again.Criminal Minister Takeshi Kiya (played by Bengal) instructs that the search is only the responsibility of the jurisdiction, and Naha is increasingly distrustful of the incomprehensible response from the superiors.On the other hand, Ma Eda, who is looking for the boss behind “Southern Cross”, learns about the secret activities of Kawahira (played by Kazuki Sawamura), one of Okinawa's leading industrialists...

And, the people in the countermeasures room who were monitoring Masami (MAAKIII)'s actions finally arrived at the lair of Miyazato and others, but things changed suddenly there——.

Mahoda conducted an investigation into Chuanping at the secret base, but was criticized by “You who abandoned the island, don't talk about the future of Okinawa”.Tamaki was worried about the wavering Maeroda and encouraged him: "There are some things that only you can do."

Afterwards, Mahoda met Ikezawa again and learned that after diplomat Miller (played by Jeffrey Law) returned to Okinawa, he used what Inamine (played by Sakumoto Takara) said on the hospital bed as a clue to trace the truth behind the $1 million robbery.Let me go….

Zhengmei wanted to save the palace and others, so she surrendered to the police.Mahoda and Yonaha found out that Kawan Ping and Miyazato were lurking in “Southern Cross”, so they stepped into the $1 million handover scene.Surrounded by the Ryukyu police and CID, the 19-year revenge drama finally came to an end.

Then, in the process of returning to Okinawa, Tamaki took Mayada to the seaside and began to tell all the truth.The crime suspense drama set in the turbulent Okinawa comes to an end——.