Ep. 7: Incident Of Monthly Presents And Threats

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Once a month for the past two years surgeon, Ogawa Masayuki, has been receiving anonymous toys and money valued over 25 million yen. He asks for Kogoro's help to determine who is sending the gifts. On Conan's suggestion, they review Ogawa's patient history. During the investigation Ran begins to suspect that Conan is actually Shinichi. When Conan plays a video game Ogawa received, Conan discovers that it belonged to a child named Ogino Tomoya who died during one of Masayuki's operations three years previously. Conan deduces that Masayuki's son, Ogawa Yuta, may be in danger. They find Mr. Ogino, Tomoya's father, and Yuta at the park just in time to prevent the son's murder. Masayuki decides not place any charges and comforts Mr. Ogino regarding his son's death. Conan manages to deceive Ran that evening about his true identity; by having Professor Agasa call her pretending to be Shinichi. (Source: Wikipedia)