The case continues about the unknown women and the mysterious man who have committed suicide at the detective agency. Kei Kashitsuka explains more further about the situation and reveals more of herself. Tōru, Kogorō, Ran and Conan are bringing Kei to her home, were Conan suddenly has to go to the restroom because he forgot to got while at the detective agency. Conan then smelled something strange while entering Kei's home. Kogorō and Tōru also wanted to get in Kei's house to do something which Kei invited them in. While in Kei's apartment, Ran got a call from Sera which starts yelling at Ran because she didn't picked up her phone while Sera called her numerous times. Sera's voice starts to fade constantly which Tōru hung up their phone call stated that the living room might be bugged. Tōru tells Kei that they are going around to each room if there are any devices around. Kei ask them to wait for 5 minutes to take her underwear and some other stuff. Kei then tries to leave the house which Conan caught her leaving, lying to him that she is going to a convenience store. Conan then asks if he will come along with her and also wanted to ask Ran to come with them too, but Kei says that only the two of them will go to the convenience store. Kogorō noticed that Kei have been left 10 minutes ago which Tōru tells them to search for the tracking devices on their own. Tōru, Kogorō and Ran found already 3 tracking devices, which they also enters a restroom with a strange scent. They've found a briefcase under a bed which they open it containing a dead body. Meanwhile, Conan have fallen asleep after drinking the fruit juice that Kei recommended him from a vending machine which can be that Kei drugged Conan.