Mita Denki Sangyo, a large electronic appliance manufacturer discloses improper accounting of 150 billion yen at a press conference. A financial consultant Koga Ryo manipulates its flustered CEO behind the scenes. Kobori Yumiko, the director of the Second Investigative Division, suspects window dressing and feels something is wrong that the company avoided delisting on the stock exchange. So she launches an investigation. Meanwhile, the head of Mita Denki Sangyo’s Management Audit Department, who is considered a key person, commits suicide. Koga secretly meets with the company’s advisor Higashida Shozo right after that. Yumiko begins to suspect that the suicide was murder. The man in question is smiling warmly at his common-law wife Murata Sachiko. Who exactly is he? Koga grew up in a poor coal-mining town with a mother who was loose with money and men. In his desire to take his younger sister Mutsumi to Tokyo, knowledge is ingrained in him by his former superior Nakano Tetsuomi and he succeeded in national securities. However, several years later, an incident triggers the start of his revenge and he lays an unexploded bomb deep in the layers of Japan’s economy.