Inspector Duchu is in the middle of a wrongful conviction on charges of robbery and rape. Convinced of his innocence, he chooses to go on the run, hiding from the police while searching for the truth. Along the way, he risks his life to save Mayumi, the daughter of a rancher, and the two of them gradually develop a strong bond. With the help of Mayumi and her father, Duchu finally unravels the mystery and finds the man who falsely accused him, Yokomichi Shinji, in a psychiatric hospital, but by then he has lost his mind. In order to find out the truth behind the matter, Duqiu disguises himself as a patient and stays in the hospital, launching a discreet investigation. As clues emerge, a huge political conspiracy comes to light.