Business Plot is a mission in Red Steel. It's the fourth level in "Act 2: The Path of the Katana Giri".
In assisting the Sanro Kai, Scott Monroe heads to the Business District because Kenzo Chiba, a member of the Sanro Kai, has switched sides and joined the bad Yakuza. He is now in charge of financing crime instead of legal endeavors. Upon entering the District, Scott enters the Sato Financial Group building in search of Kenzo. Fighting his way through the skyscraper, Scott finds Kenzo and is successful in convincing him to switch back to the Sanro Kai.