Haru Kato, a detective working for the Modern Crime Prevention Task Force in the Metropolitan Police Department, has been ordered to work on security at the Classic Car Festival being held in Ginza. At the event, he runs into his former colleagues from the First Investigation Division, who were called in because of a bomb threat. As the time until the bomb is set to explode quickly approaches, he suggests that they should cancel the festival but no one listens to him. In this tense situation, Daisuke Kambe, who claims to be the newly appointed inspector, arrives on the scene.

Daisuke and Kato are ordered by their boss to become partners. They find a pair of comedians performing on the street and suspect that they are involved with drugs. They contact the Metropolitan Police Department about the comedians, but it becomes apparent that Kato and Daisuke have completely different approaches to solving crimes. The kindhearted Kato is disgusted by how Daisuke relies on his wealth to solve problems. They both go their separate ways in the investigation. Kato asks a journalist who he is friends with to help him gather information. While they are on a stakeout, they meet a mysterious woman.

The president from the Republic of Poliador arrives in Japan, and the Modern Crime Prevention Task Force are assigned to assist the First Investigation Division in protecting the embassy from the outside as security personnel. Daisuke is invited inside the embassy as a representative of the Kambe Group. After the dead body of an embassy employee is discovered inside the building, the president and Daisuke are forced to evacuate to the panic room. Daisuke traces the footsteps of the suspected killer by hacking into the surveillance cameras. Kato finds the suspect as he attempts escape and tries to apprehend him.

Even after those people were murdered, Daisuke claims that this incident is an internal problem of the Kambe family. The rift between Daisuke and Kato has become so serious that they decide to go their separate ways. However, Kato is apprehended by the First Investigation Division as a material witness. The remaining members of the Modern Crime Prevention Task Force follow the clues about the suspect that Cho-san left behind. Suzue claims to have seen the actual suspect inside the Kambe residence, and clearly states that it was none other than Shigemaru Kambe.