An epic of love and death that depicts how soldiers and ordinary people lived and fought during the Russo-Japanese War, when Japan's very existence was at stake in the face of the great power of Russia.

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.

During the Kyoho period in the reign of Tokugawa Yoshimune, there is a gang of thieves active not just in Edo but also the Tokaido and the Nakasendo, and all across the Kansai region, stealing large sums of money with skillful techniques. They only target the very wealthy and never kill or injure people. They appear with the clouds and disappear like the mist. On the night that the beautiful Ochiyo is to become the bride of a dry goods dealer, a large amount of money hidden inside the shop is stolen. The gang disappears without injuring anyone. It was a two-year plan to marry Ochiyo off so that she could bring them in. The leader of this gang is Kumokiri Nizaemon, the greatest bandit of all time. He keeps a rein on his highly-skilled and notorious followers Nanabake no Ochiyo, Kinezumi no Kichigoro, Subashiri no Kumagoro, Ingakozo Rokunosuke and others.

Two police investigate the death of a corpse found in a train yard.