Detective Ukyo Sugishita confronts crime on the basis of his own convictions. He has a partner that works for him in the Special Task Unit. For the first 7 seasons, Ukyo’s first partner is Kaoru Kameyama. He is a good-natured, hot-tempered, straightforward and somewhat scattered detective. Beginning in Season 8, Takeru Kanbe replaces Kameyama. Contrary to his predecessor, Takeru is a lanky, cool, conceited and confident detective. From Season 11 to Season 13, Ukyo’s partner is a young detective Toru Kai. Toru is a son of Deputy Director-General of The National Police Agency. But he became a detective by his own effort. And starting with Season 14, Ukyo’s current partner is Wataru Kaburagi, an elite bureaucrat who came to the Metropolitan Police Department on temporary assignment. As the first partner without any career of a police officer, he will face challenging cases together with Ukyo.

Higuchi Ichiyo is the first female professional novelist in Japanese literature. This tanpatsu drama is a biography of her personal life.

The sudden death of a journalist stirs up young editor Noriko's curiosity. While investigating the case, Noriko uncovers the dark secrets hidden behind the journalist's death and its relationship to a popular female novelist.

In this direct continuation of the earlier special, Godai tries to figure out what to do with his life after college while competing with Kyoko's impossibly perfect tennis coach for her affection.

Kumada is mistaken for the culprit at the scene of an assassination attempt on the governor of Tokyo and is escorted away. Meanwhile, a bomb threat is announced at the police station and the station is blown up. Kumada finally returns to the investigation amid suspicions that there is a spy among his own people. He sets out to get to the bottom of the case.

Shinjuku Kabukicho, Asia's largest entertainment district. Gangsters and the Chinese mafia are vigilantly targeting the town's huge concessions. One day, Detective Kumada, who belongs to Section 4 of the Shinjuku Chuo Police Department's anti-gang team, receives information that a bomb has been planted somewhere in Kabukicho...

Kumada is arrested for the murder of the Chief. He denies the charge, but the bullet removed from the Chief's body matches the bullet from Kumada's gun, and the situation becomes increasingly unfavourable. Just then, Kumada receives a threatening phone call on his mobile phone, threatening to assassinate the Governor of Tokyo. Furthermore, a war breaks out between the Black Dragon and the Kinugawa clan...

Set in Shinjuku's Kabukicho district, a town that never sleeps, a detective in charge of the Investigation Section 4, known as "Marubo", takes on the underworld, including numerous fights and terrorist attacks. T The Kinugawa clan has been decimated. Behind the scenes, the shadow of the Black Dragon is hidden. At the same time, a threatening letter arrives with an arson threat addressed to the Governor of Tokyo, and the security system is strengthened, but someone makes the first move. The confused police suspect that someone is leaking internal information...

Sakuma, who was supposed to be dead, is alive. This brings the terror case to a sudden development. Kumada continues his investigation and tries to find a solution with the help of Kajiyama of the Kinugawa gang. Meanwhile, at the task force, a surprising relationship between the perpetrators and the police comes to light during the identity investigation.

In the near future, crime runs rampant in the streets and two major mafia groups are battling for power. In order to eliminate the two mafia groups, the Tokyo Metropolitan Police Department orders an undercover investigation of their headquarters. However, the ones chosen for the mission are four people known as "losers". Will they be able to successfully solve the case?