Conan investigates the two rooms one last time and brings Kogoro to the séance room and tranquilizes him. Conan reveals that after the culprit killed Hirasaka, he locked the room from the outside, and used one of the giant Kira posters to slide the key back into its drawer and close it before ripping it into pieces and throwing it into Hirasaka's room. As for the séance room murder, the culprit used the remaining posters, rolled them up, and taped them allowing them to support his weight and giving him the support to leave through the window; a rope tied to the poster allowed him to pull it out with him outside the window and its ripped remains are found in Hirasaka's room. He closed the window with the use of Hirasaka's remote controlled appliance. Conan then points out Mifune as the culprit, evidenced by the wine under his necktie. Mifune confesses and explains he was dating Kira before she died.
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