大奥犯科帳

Dobu, an Edo samurai, is tasked with investigating a string of noble murders in Kyoto, disrupting his routine in Shimotani.

After six exiles return to Edo, four are mysteriously killed. Two survivors, Kosuke and Kingo, lead a search to uncover a hidden motive behind the murders.

In Edo's autumn, a wave of murders hits, targeting those linked to an old case. A young man, Utaro, takes charge, but Dobu's love interest is involved.

After two thugs are killed, Dobu and his crew have three days to catch the murderers. Dobu suspects a hidden mastermind influencing the magistrate.

A spree of murders in the city targets peddlers and komuso monks, all killed in the same method. Dobu investigates after a ronin's death with a unique clue.

Mondosuke ventures alone into the land of Nagasaki. There, he encounters young lady named Kinue, the daughter of Nagasaki's former magistrate office constable, Shusuke Kaneko. Monsuke has received information that Shusuke has been captured on charges of embezzlement, prompting him to head to the magistrate's office. However, the arrival of the Chief Inspector, Shigehide Ogiwara , obstructs Monsuke's actions.

The Satsuma clan conspires with key figures in the shogunate to overthrow the government. However, the head inspector, Naito Yamashiro no Kami, cannot find the sworn statement of rebellion and takes responsibility by ending his own life. This deeply affects Mondonosuke Saotome, who was close to Yamashiro no Kami and who is known for his restless nature. Seeking an audience with Shogun Tsunayoshi to request a view of the sworn statement, Mondonosuke Saotome is granted permission to go to Satsuma. He sets off on this journey accompanied by Sasao Kinai and Yamashiro no Kami's sister, Shizue . However, on the way, they are attacked by a group of mountain monks. Mondonosuke Saotome manages to repel the monks in a brawl but becomes separated from Kinai and Shizue. Afterward, he encounters a mysterious woman named Oren, and with her guidance, he finally arrives in Satsuma.

One night, Sawatari Shusui saves a geisha named Osode from a ninja attack. Osode's mother is said to be carrying the child of the shogun, Tsunayoshi, and has hidden herself on Hachijo Island. Shusui heads to Hachijo to verify the truth. Meanwhile, Shusui had heard from Tsunayoshi that he was planning to appoint the Kofu Chancellor, Tokugawa Tsunatoyo, as the next shogun, but Sumi's father, Makino Bizen no Kami, whose daughter was pregnant with Tsunayoshi's child, was planning to have his daughter's child ascend to the shogunate and seize real power. Amidst all this, Shusui, along with Osode and his servant, Sasao Yoshinari , sets foot on Hachijo Island and meets Tsunayoshi's son, Kotaro, who was born to Osode's mother. But then a group of ninjas attacks.

A marriage proposal from the Kishu family is presented to Kikuji, but her brother, Sawatari Shusui, declines it. Around the same time, the lord of the Kishu family dies under suspicious circumstances. Determined to resolve the turmoil within the Kishu domain, Shusui embarks on a journey. The proposed suitor for Kikuji is Shin'nosuke, a young samurai who recently saved Shusui from an attack but left without receiving thanks. Shin'nosuke, heir to the Kishu domain, has headed back to Kishu. However, Iwakura Guntayu, the Edo elder of the Kishu domain, is plotting to install his concubine's child as the new lord and seeks Shin'nosuke's life. Accompanied by Kikuji and his servant, Sasao Yoshinari, Shusui hastens to Kishu to confront the brewing crisis.

Sawatari Shusui saved Princess Hiroko of the Konoe family, who was about to be married to Tokugawa Tsunatoyo. However, Hiroko, a tomboy, disappears. As someone is after Hiroko's life, Shusui pursues her whereabouts... Meanwhile, Sasao Yoshinari and Shusui's sister, Kikuji, who were following Shusui, meet a young man and Kikuji is captivated by him, but they do not realize that he is Hiroko in disguise as a young man. Shusui is set to search for Hiroko with her attendant Orui, but that night they are attacked by a group of ninjas at their inn.

Sawatari Shusui was told about 7,000 ryo of buried gold by Osuke, who claimed to be a princess of the Fujiwara family. Shusui speculates that powerful people in the Date family and the shogunate are planning to overthrow the shogunate using buried gold and gets excited about a major national crisis. He gets separated from Osuke due to interference but with the help of his sister Kikuji and others he tracks down Osuke's whereabouts. He then realizes that Osuke is not from the Fujiwara family but is actually the daughter of Edo elder Itakura Shōken who has been confined under the pretext of an epidemic disease. Having promised to help Osuke, Shusui goes up to Edo Castle and advises shogun Tsunayoshi not to visit Nikkō Tōshō-gū Shrine which has been restored by Date family because "evil spirits are attached". However, Tsunayoshi is furious and orders him to stay under house arrest.