In the city of New Mercia, crime lords and gangsters rule streets, and the police are just as corrupt as the criminals they arrest. None are safe from this criminal war that is underway. 
When a young woman from a Yakuza crime family arrives in the city for an arranged marriage to a local mafia boss, she decides that it's time to take matters into her own hands to end this war, and bring all the criminal enterprises under her own banner. She will dominate this city as its undisputed shogun of crime, but first she must deal with the backstabbing and underhanded tactics of rival gangs, the police, and her own subordonates. How will she endure and bring her dreams to fruition?
This is a retelling of the conquest of Oda Nobunaga told in a new time period and new way, with the characters acting as stand ins and representations of their historical counterparts.