Abunai Deka

One night, Takayama and Oshita were pursuing a suspicious vehicle. However, the patrol car accompanying them was blown up by a rocket rauncher, killing two uniformed police officers. Around the same time, at a research center of a major pharmaceutical company, two engineers in charge of new drug development were murdered, and data on an anti-cancer drug under development was destroyed. Based on eyewitness accounts, the Minato Police Station issued an arrest warrant for Hyōdō, a mercenary marked by public security as a professional saboteur, as a suspect in both incidents. Meanwhile, Takayama and Oshita obtained information about an art dealer named Narumi who had made a huge profit from the surge in the stock price of a rival company following the research center attack. They apprehended Narumi's secretary, Yūki, to try and pressure him, but Hyōdō instead kidnapped Kaoru and demanded an exchange for Yūki.

Takayama and Oshita were investigating a man named Nagamine. He was a suspicious figure rumored to be involved in various illegal businesses, including gambling, prostitution, and drugs. One night, they arrested Ogata, a drug trafficker under Nagamine's influence. However, the next morning, Nagamine's legal counsel visited the Minato Police Station, and Ogata was released due to insufficient evidence. Immediately afterward, Takayama and Oshita received a call from Ogata requesting protection, but during the call, Ogata was shot and killed by an unknown assailant. The keyword "bombing" that Ogata left behind before his death raised suspicions that Nagamine was planning a terrorist act. Therefore, Takayama and Oshita sought the cooperation of Hagiwara, a reporter who had been closely covering Nagamine, to exchange information.

One night, Takayama and Oshita raided a gun manufacturing plant. The ringleader, Miyasaka, was a subcontractor for the Ginsei-kai gang and also a key asset in their plan to dismantle the organization. However, despite their surprise attack and pursuit, Machida's carelessness allowed Miyasaka to escape. While Takayama and Oshita were pressuring Ginsei-kai chairman Maeo, it was discovered that Miyasaka's handgun was identical to one used in a murder case involving a trading company 15 years prior. The statute of limitations for that case was only four days away. As the Minato Police Station began a full-scale investigation, pressure from the prefectural police headquarters began to mount.

Six years after Chief Kondō's retirement, Fukamachi arrives from the prefectural police headquarters as the new head of the investigation division. He is frustrated by the problematic behavior of Takayama and Oshita and repeatedly scolds them. Meanwhile, the Minato Police Station busts a drug deal at a high-end club in Kannai, but shortly afterward, the club is bombed. Takayama and Oshita visit the hospital to question the injured hostess, Higuchi Asami, and stumble upon the scene where Asami is being kidnapped. After a fierce gunfight, Takayama and Oshita manage to rescue Asami. As they continue their independent investigation behind Fukamachi's back, the existence of a cult organization called "Bremen" comes to light.

Immediately after "Forever TV Special '98", Jojima's plans is stopped by Takayama and Oshita, who also seriously injure Jojima and arrest him. That night, when the case seemed solved, Jojima brutally murders a nurse and a police officer and escapes again. The prefectural police headquarters, exasperated by Takayama and Oshita's repeated reckless behavior, was about to order them to resign. However, Fukamachi was secretly lobbying headquarters and working tirelessly to prevent their resignation. Unaware of this, the two learned of an attack by the Jojima gang and tried to stop it. A clue from one of the Jojima gang members who died led to a man named Date emerging as the mastermind. Date had joined the international terrorist group NET and was now one of its top executives, carrying out acts of sabotage around the world. Takayama and Oshita raced against time to stop Date's terrorist plans.

Following the NET incident, Takayama and Oshita were hired as undercover agents and were investigating criminal organizations in Asia. Then, in 2005, the two reunited in Busan, South Korea, at a scene where a Korean mafia and an international criminal organization were conducting a black market deal for a miniature nuclear bomb. Although they seize control of the transaction site, they failed to secure the bomb. After completing their major undercover assignment, the two returned to Yokohama, only to be shot by an unknown assailant. They were apprehended by Mizushima and Kanuma, two young detectives from the Minato Police Station who happened to arrive at the scene. Sensing a generational shift at the Minato Police Station, Takayama and Oshita then encountered a case where Bitō, the perpetrator of a bank robbery they had arrested seven years prior, escaped from prison and began killing his former accomplices. Now reinstated as detectives, Takayama and Oshita pursued Bitō.

Takayama and Oshita were just five days away from retirement. Despite the concern of Machida and Fukamachi, who wanted them to retire peacefully, the two enjoyed fighting criminals until the very end, but they also harbored secret dreams for their post-retirement lives. Takayama, in particular, was about to embark on a new life with his beloved girlfriend, Natsumi. Their final target as detectives was Inō, a remnant of the Ginsei-kai, who was now a high-ranking member of the newly formed organization "Tōryū-kai", controlling an illegal black market. They raided the scene and pursued Inō, but a mysterious rider thwarted their efforts, allowing him to escape. The next day, Inō was found dead. As the power balance between the crime organizations began to crumble, Kyōichi Garcia, a Japanese-American executive of the Central American crime organization "BOB", appeared. As Garcia attempts to turn the Tōryū-kai into a puppet organization by killing key figures in the Chinese mafia and the organization, Takayama and Oshita embark on their final investigation.

After retiring, Takayama and Oshita, who had been running a detective agency in New Zealand, got into trouble with the local police, they returned to Yokohama and reopened their "T&Y Detective Agency". Ayaka Nagamine, who had come from Nagasaki searching for her mother, appears as their client. Ayaka's mother was a well-known Yokohama singer named "Natsuko", but she had traveled to Hong Kong and had been missing for about 20 years. Meanwhile, Takumi Kaidō, the president of the giant venture company "Hydonic" and son of Maeo, the second-generation chairman of the Ginsei-kai, was promoting a casino development project in collaboration with a Hong Kong company, aiming to "revitalize the Yokohama economy". A series of murders related to this project had occurred. Takayama and Oshita visit Machida to ask for his help in finding Natsuko, but they find themselves targeted by mercenaries from Kaidō's armed security company.