Conan investigates reveals that Somei tampered with the evidence to suggest Nakama was alone during his time of death. Conan reveals that there were originally two plates, two cups of coffee, and two pieces of cake. Somei took the piece of cake and placed it with the other piece to make it seem as if they were one piece. He then poured coffee from one of the cups into a plant and pretended the cup was a container for pens. For the other plate, he placed it under the spilled coffee cup to act as a saucer. Somei confesses to the murder; Conan at the same time tranquilizes Kogoro to reveal that Somei is innocent. He reveals that a store employee heard Somei talking to Maiko at the time of the murder before calling Kogoro for the meeting; However, the meeting has been cancelled the day before. This suggests that Kogoro was used so Somei would be able to enter Nakama's apartment and tamper with the evidence. Conan reveals the only motive for Somei's actions was to cast suspicion on himself so Maiko's name would not be tarnished with murder. Conan deduces that the phone call from Maiko was so she could confess her love to him before she committed suicide by jumping off the twenty story building. As evidence, Conan reveals that Somei, who was late to the meeting, must have hid Maiko's body in the trunk of his car. Conan reveals that Maiko murdered Nakama because he was harassing and overworking Somei and seeing him tired motivated her to murder.