Case Closed - Season 1 - Eps 605: The Seance's Double Locked Room Mystery (Opening of the Locked Room)
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.
About Case Closed

Title: Case Closed
First Air Date: 1996-01-08
Last Air Date: 2025-03-08
Status: Returning Series
Rating: 8/10 (from 683 votes)
Language: JA
Seasons: 2
Total Episodes: 1157
Network: YTV
Genres: Animation, Crime, Mystery, Comedy
Production Companies: TMS Entertainment, Kyokuichi-Tokyo Movie
Synopsis
The son of a world famous mystery writer, Jimmy Kudo, has achieved his own notoriety by assisting the local police as a student detective. He has always been able to solve the most difficult of criminal cases using his wits and power of reason.
Cast

Minami Takayama
Conan Edogawa (voice)

Kappei Yamaguchi
Shinichi Kudo (voice)

Wakana Yamazaki
Ran Mouri (voice)

Akira Kamiya
Kogoro Mouri (voice)

Rikiya Koyama
Kogoro Mouri (voice)

Megumi Hayashibara
Ai Haibara (voice)

Kenichi Ogata
Hiroshi Agasa (voice)

Yukiko Iwai
Ayumi Yoshida (voice)

Wataru Takagi
Genta Kojima (voice)

Ikue Otani
Mitsuhiko Tsuburaya (voice)