Rui Kamishiro is a professional investigator. Rui is a rather calm and confident person. He always answers calmly and directly, sometimes he can psychologically put pressure on people and manipulate them. It has been working for more than 10 years. He skillfully uses documents and other evidence. If necessary, he can threaten with a pistol, but never shoots. Almost never raises his voice and tries to gain confidence. His next case is blond Tsukasa, who is suspected of illegal sales.