Police Chief Tachiki, who heads the Tachiki Detective Agency, suspects that Tatsuo is the Skull Man. Tatsuo, in turn, suspects that the detective is a part of a public conspiracy that has been after him for fifteen years. It turns out that Tatsuo's parents were murdered and he was adopted by the Kagura Clan. For fifteen years, Tatsuo has been hunting for the mastermind, who manipulates all industry, finance and even politics. Tatsuo, the Skull Man, threateningly demands Tachiki that he tell him the name of the mastermind. After muttering the culprit's family name, Chisato, the Skull Man shoots him in the head.