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 two ronin that Sawatari Mondonosuke (Kitaoji Kinya) saved were secret envoys from Ryukyu. They could not stand the tyranny of the Satsuma clan and were trying to appeal to the shogunate. But they were captured by someone afterwards. Mondonosuke's boredom bug started to stir... Mondonosuke rescued the two who were imprisoned in the mansion of the chief elder, Okubo Iga-no-kami (Nakamaru Tadao), as well as a senior official, Mamoru (Ishiyama Teruo), and his niece, Reika (Takagi Saya), who had also escaped from Ryukyu. The Satsuma clan hired Wakura Juro (Nakatani Ichiro) to assassinate Mondonosuke through his daughter O-Ran (Yamamoto Midori),who is a spy .

Kitaoji Kinya 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 (Komura Hiro) 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 Shoken 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 (Nagato Hiroyuki) not to visit Nikko Tosho-gu 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.