Police on patrol find a red box. In it are the remaining pieces of a body murdered by someone called Phantom Thief Sai. Meanwhile, Yako and Neuro are hired by a man who is suspicious of his son's actions after he came home with blood on his jacket. Neuro and Yako tail the man to a destroyed building where they discover he is a fan obsessed with Phantom Thief Sai. The young man has been practicing how to kill properly in order to become him. When the police try to arrest him the real Sai appears. The copycat Sai is then killed by the real one, only for Neuro to stab Sai in the chest. Sai agrees to go with the police, killing them moments later and telling Neuro that he will be back.