- 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))
- Chafurin (Juzo Megure (voice))
Detective Conan — S1E223
Episode: And There Were No Mermaids (The Deduction)
Air Date: 2001-02-05
Runtime: 25 min
Overview
Conan and Heiji investigate Naoko's brutal murder and discover a trail of fish scales that suggest Naoko's killer came from the sea.