Invited for a anniversary celebration, Kindaichi, Miyuki and inspector Kenmochi re-visit the Opera House. There they discover that a play of The Phantom of the Opera is being rehearsed again. However, it doesn't take long when members of the acting troupe are killed by the Phantom. Kindaichi will once again have to solve a murder series in the Opera House.
Unfortunately the movie Kindaichi Case Files Movie 1: The Opera House Murders is not yet available on HBO Max.
| Directing | Daisuke Nishio | Director |
| Production | Michihiko Suwa | Producer |
| Writing | Takuya Nishioka | Screenplay |
| Visual Effects | Shingo Araki | Character Designer |
| Visual Effects | Michi Himeno | Character Designer |
| Visual Effects | Shingo Araki | Animation Director |
| Visual Effects | Michi Himeno | Animation Director |
| Art | Junichi Taniguchi | Art Direction |
| Sound | Kaoru Wada | Original Music Composer |
| Camera | Masatoshi Fukui | Director of Photography |
| Editing | Masaaki Hanai | Editor |
| Editing | Shinichi Fukumitsu | Editor |
| Sound | Kenji Ninomiya | Sound Recordist |
| Sound | Yasuyuki Konno | Sound Effects |
| Sound | Tadao Takakuwa | Music Producer |
| Sound | Naomi Machida | Music Producer |
| Sound | Yuuko Tsuburaya | Theme Song Performance |
| Writing | Shin Kibayashi | Author |
