During the hectic year-end period at the Bayside Police Precinct, Detective Aoshima returns after a misconduct incident. Despite resistance, he's assigned to Traffic Division. However, Aoshima can't resist meddling in an assault case. A murder occurs, and a new commander arrives. Aoshima arrests a suspect, but the suspect escapes custody and takes the Criminal Investigation Division hostage with a rifle.

Newly graduated police officer Natsumi is assigned to the Traffic Division and paired with the stern senior officer Sae. Natsumi's enthusiasm and clumsiness often lead to trouble, and she starts questioning her future in the police force. Her life takes an unexpected turn when she becomes entangled in a dangerous case involving a wanted criminal.

Aoshima returns to the Bayside Precinct and gets involved in a new investigation. Unexpectedly, the case takes a complex turn, leading to a dangerous situation and raising suspicions about one of his colleagues. As the investigation unfolds, Aoshima faces challenges from within the department while trying to apprehend the elusive criminal.

Aoshima, a police detective working in the Bayside Precinct, is continually frustrated by the hierarchy and red tape that plague the system. His friend Muroi is climbing the ladder of the police bureaucracy. Muroi has made a pact with Aoshima that while Aoshima looks after the streets, Muroi would make life easier for the cops on the beat. One day in Bayside, a series of events turns the small station upside down.

The movie takes place again in the fictional Wangan Station of the Tokyo Metropolitan Police Department the once empty space within Wangan's jurisdiction has become a popular tourist attraction. When a string of murders of company execs begins taking place, Aoshima jumps at the opportunity to pursue something other than his current case, which he finds less than inspiring. However the powers that be have other ideas, and Wangan again plays host to a special investigation team from headquarters. Aoshima's friend Superintendent Shinji Muroi, assigned by headquarters to assist Okita, is again powerless to help the local officers as decisions are made by the higher ups.

On November 24, 2003, soon after police had closed down the Rainbow Bridge to apprehend the perpetrators of the “Daiba serial murder case,” police “negotiator” Mashita (Yusuke Santa Maria) found himself surrounded by reporters outside the Bayside Police Department. “Well, yes, I’ve been getting a lot of attention as the department’s first official negotiator….” was Mashita response to a reporter’s question. One year later, that remark would come back to haunt him, embroiling he and all of Tokyo in a subway crisis of potentially disastrous proportions. Tokyo, Dec. 24, 2004. Christmas Eve. As dusk falls, the crush of commuters mounts. Not a good time for all the city’s subways to stop running. Suddenly, the Metropolitan Police Department is faced with perhaps their biggest crisis ever. Somebody has hijacked the “Spider E4-600,” a state-of-the-art prototype super train, and is remotely controlling it via the Internet to run rampant through the massive web of underground railways that lies beneath Tokyo. Police Superintendent Muroi (Toshiro Yanagiba) summons negotiator, Mashita, who is told, to his horror, that the mystery train jacker, who goes by the name of “Dangan (Bullet) Liner,” has named Mashita personally to “come out and play on the trains.”

One day in February, 2005, Metropolitan Police Department Superintendent Muroi (Toshiro Yanagiba) is arrested to take responsibility for a botched murder case he headed. His faithful colleagues, including Arashiro (Toshio Kakei) and Okita (Miki Maya), only exacerbate the situation when they try to help clear his name. Is Muroi guilty as charged or merely taking the fall? What is the truth behind the murder? Two lawyers, one determined to get Muroi, the other resolved to save him, a feud between two police departments, political power plays and legal trappings, all combine to orchestrate Muroi’s downfall.

"Fugitive: Kijima Jouichirou" takes place two months before the events described in "Negotiator." A man takes a small boy hostage in a house. The police negotiator, Mashita (Yusuke Santamaria), tries to talk the kidnapper into giving up the boy, but is unsuccessful. Detective Kijima (Susumu Terajima) takes over and rescues the boy by force. However, when the police try to take the boy back to his parents he panics and puts up resistance. After talking to him, Kijima takes the boy under his wing and escapes, becoming a fugitive himself.

Hideki Haijima (Norito Yashima) is a lawyer from the previous Bayside Shakedown spin-off movie "The Suspect" who is the focus, caught up in the battle over an important piece of land. The tv movie is directed by the assistant director of THE SUSPECT, Daisaku Kobayashi.

After Detective Shunsaku Aoshima (Yuji Oda) is promoted to section chief he has the daunting task of dealing with eight cases at the same time, which includes a murder case, bomb threat, and a bus hijacking. Complications also arise between Detective Aoshima and his juniors.

Detective Shunsaku Aoshima (Yuji Oda) is now promoted to a section chief at Wangan Police Station. Meanwhile, Masayoshi Mashita (Yusuke Santamaria), who is now the police chief announces that Detective Ou (Kenichi Takito) will have a large scale wedding. Government official Shinji Muroi (Toshiro Yanagiba) and high ranking public officers from China will attend the wedding. Everyone at the police station soon gets nervous about the wedding and the police station becomes chaotic. The police officers then learn that an international marriage swindler, who is on the international most wanted list, has arrived in Japan.

Set 2 years after prior film "Bayside Shakedown 3: Set the Guys Loose," a major case occurs that has the potential to take down the entire police organization. For the next 3 days, Shunsaku Aoshima (Yuji Oda) and his colleagues struggle to unravel the case ...