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, a young detective Toru Kai becomes Ukyo’s partner. Toru is a son of Deputy Director General of The National Police Agency. But he became a detective by his own effort.

From Season 14 to 20, Ukyo’s partner is Wataru Kaburagi, an elite bureaucrat who came to the Metropolitan Police Department (MPD) on temporary assignment. As the first partner without any career of a police officer, he faces challenging cases with Ukyo using his own authority and connections, and eventually officially joins MPD.

And from Season21, the first partner, Kaoru Kameyama is back! Kaoru had retired from the MPD and relocated to Salween, a small country in South Asia. When he temporarily returned to Japan as a member of a goodwill delegation, he was reunited with Ukyo by fate.