When a doctor is found dead and the company's exclusive data on a cancer drug is missing, detective Takayama and Oshita are called to the Nakamitsu pharmaceutical laboratory. However, a bungled attempt to catch the murderer leave Takayama and Oshita reassigned to the lackluster task of patrolling public bathrooms to keep them out of trouble.

Detectives Takayama and Oshita participate in a major drug bust which arouses suspicion that the government may be secretly involved.

Taka and Yuji find evidence in a 15-year-old case, but the statute of limitations expires in four days and they're hunting illicit gun manufacturers.

Toshiki Takayama (Taka) and Oshita Yuji, who had retired as detectives and opened a private detective agency in New Zealand, returned to Yokohama for the first time in 8 years. One day, a Japanese lawyer living in Hong Kong is murdered. Taka, who felt suspicious about the incident, visits Liu Fei Long, a man who has a connection with the two in the past, but Taka is worried that Stella Lee, a business partner of Fei Long, who he met there, looks like his former lover. At the same time, a young woman named Ayaka Nagamine visited the pair at the "T&Y detective agency", asking for help in finding her mother. Natsuko, Ayaka’s mother, was an old acquaintance of Taka and Yuji. The pair started searching for Natsuko, but there was a series of murders in Yokohama. Eventually, these escalate, and a terrorist plot involving a bomb is afoot.