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Kobayashi enters the music room where the culprit proceeds to attack her. However, she manages to incapacitate the culprit with a suplex and is revealed to be Sato in disguise. The Detective Boys and Shiratori appear revealing Sato replaced Kobayashi in the hallway and names the culprit to be Ryuusuke Kodama . The Detective Boys reveal that Kobayashi's testimony was correct and that she mistook Kodama to be a woman in the alley due to his long hair and the position of his arm making him seem as if he had breasts. Conan explains the woman's voice that was heard belonged to the victim, and that 09 was actually OS and stood for the first two letters of Osaka Nico Nico transportation . Shiratori reveals that they questioned the truck driver who saw the victim and Kodama entering the alley. Kodama confesses and explains that Sumida planned to kill Kodama to receive money from his life insurance to settle his debt and murdered her in self-defense.