時は享保、徳川吉宗の治世。幕府は財政危機に陥っていた。この事態を打開する切り札、それは家康が残した莫大な『徳川埋蔵金』! その在り処が示された地図を手に『忍びの虎次郎』が向かうのは、未だ国はなく先住民族と移民が割拠する新大陸アメリカであった! そこで出会った女インディアンと埋蔵金に数奇なつながりがあり…。未開のアメリカを舞台に、歴史には語られないもうひとつのゴールドラッシュが始まる!!!! It is the Kyoho Era, during the reign of Tokugawa Yoshimune, and the shogunate is in the midst of an economic crisis. However, they have a trump card which could be the key to breaking them out of these dire straits--the "Tokugawa Buried Gold", a massive sum of gold left behind by the first Tokugawa shogun, Ieyasu! With a map to its location, the ninja Kojiro heads off to find it. That location? America--the New World--still divided between the indigenous peoples and the colonists! There Kojiro meets a Native girl who has a mysterious connection to the buried gold...
Chapter 24