A widowed restaurateur is faced with scandal after discovering her late husband had a child out of wedlock. Hearing that two criminals had attempted to take over the restaurant from her late husband, she hires her late husband's best friend, a private detective, to investigate.

The great merchant of Kaga Daitokuya , had taken control of the domain with his wealth and by holding onto the weakness of Lord Maeda Tsunanori , and was planning to rule over Japan as well. In order to free the lord from evil spirits and monsters, Sawatari Shusui heads towards Kaga Hyakumangoku. On his way, Shusui helps a girl named Oyumi who was about to be bullied by a ronin. Oyumi claims to be the daughter of Daitokuya, but she is actually the daughter of Lord Maeda Tsunanori's concubine. Daitokuya, who had taken control of power by raising Oyumi on behalf of Tsunanori who could not make it public because of his legal wife, was secretly storing weapons and ammunition and was pressuring Tsunanori to sign a letter of rebellion.

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.

Team DANKAI are set to compete in the Paris-Dakar Rally, an off-road endurance race spanning thousands of miles and multiple continents. Prior to the event, DANKAI leader Mizuki is ordered by their sponsor to add popular celebrity Ryuichi Yoshii to the roster for publicity. This exacerbates DANKAI's resentments and baggage. Needing a steady hand to mediate dispute and navigate their support vehicle, Mizuki recruits legendary retired mechanic/driver Eiji Honma to the team. Soon Honma discovers his ex-wife Kei is also participating in the rally, alongside her current husband, the bullfighter Antonio Vázquez. Honma's truck also comes to include stowaway passenger Yuko Takei, Yoshii's pop star girlfriend who is trying to salvage their relationship.

Hisa Ishii and his brother Akira emigrate from Japan to the United States. They settle in rural California and start a strawberry farm, slowly integrating themselves into the life of the community, which includes Japanese-Americans of both lengthy and brief residence.