Composer
Director
Producer
Main Role
- Abe HiroshiNiina MasayoshiMain Role
- Yokohama RyuseiSeno HarukiMain Role
Support Role
- Takahashi MitsuomiNishino Toma ["DCU" 1st Division Vice-captain]Support Role
- Okazaki TaiikuMorita Nanao ["DCU" 1st Division diver / Drone pilot]Support Role
- Tosa YukiOtomo Yuya ["DCU" 1st Division diver]Support Role
- Ichikawa MikakoKuroe Mako ["DCU" Head of forensics department]Support Role
- ShuriKanda Ruri ["DCU" Cyber team staff]Support Role
- Takahashi FuuKitagawa Minahira ["DCU" Cyber team staff]Support Role
- Shunputei ShotaHayakawa Mamoru ["Japan Coast Guard" deputy director]Support Role
- Yamazaki IkusaburoShimizu Kenji [Detective of Metropolitan Police's 1st division]Support Role
- Yoshida RyoyaAoyama Kaoru [Detective of Metropolitan Police's 1st division]Support Role
- Nakamura Anne{Part 1} Nariai Takako ["DCU" 1st Division diver]Support Role
- Nakamura Konosuke Support Role
Guest Role
- Kikkawa KojiNariai Atsushi [Masayoshi's deceased partner / Takako's brother] (Ep. 1)Guest Role
- Nakamura ShikanKoyamauchi Shoichi ["Keikoku Corporation" president] (Ep. 1)Guest Role
- Miyano MamoruNoda Hiromasa ["Keikoku Corporation" missing employee] (Ep. 1)Guest Role
- Takanashi RinWakabayashi Akari [Shoichi's secretary] (Ep. 1)Guest Role
- Makoto NaoyaNoda Daigo [Hiromasa's father] (Ep. 1)Guest Role
- Tanida Ayumi[Chief of Gunma Prefectural Police] (Ep. 1)Guest Role
- Kajihara Zen Guest Role
- Naoyuki Fernandez"Rodrigo Sanchez" [Fisherman / Suspect] (Ep. 2-3)Guest Role
- Suda KunihiroShimada Ryuhei / "Shima" [Fisherman/Leader of Anti-Poachers Group] (Ep. 2-3)Guest Role
- Oishi Keita(Ep. 3)Guest Role
- Nozoe YoshihiroYanagita [Fisherman] (Ep. 3)Guest Role
- Kakuta AkihiroManabe Muneo [Professor of Forensics, Hokiku Medical University] (Ep. 4)Guest Role
- Rokkaku SeijiTsukishima Hideki ["Aqua Deep" salesman] (Ep. 4)Guest Role
- Fujii RyuseiNakabayashi Mamoru (Ep. 5)Guest Role
- Yanagi ShuntaroHimura Shohei (Ep. 5)Guest Role
- Miura RyotaKinoshita Yuji (Ep. 5)Guest Role
- Kato MasayaKimi Ichiro (Ep. 6)Guest Role
- Harada KanaTakada Kazumi [Aquarium designer] (Ep. 6)Guest Role
- Asumi RioNegishi Nayu [Aquarium producer] (Ep. 6-7)Guest Role
- Sumi ReinaTamai Chihide [Chisato's mother] (Ep. 7)Guest Role
- Kobayashi SachikoNegishi Aki [Nayu's mother] (Ep. 7)Guest Role
- Mori YuritoTamai Chisato [Chihide's son] (Ep. 7)Guest Role
- Okada KokiKasahara Eisuke (Ep. 7-9)Guest Role
- Tanabe SeiichiTotsuka Akio [Hotel manager / Akemi's father] (Ep. 8)Guest Role
- Shimazaki HarukaTotsuka Akemi [Akio's daughter] (Ep. 8)Guest Role
- Fuwa MansakuYashima (Ep. 8)Guest Role
- Mikata RyosukeKudo [Coast guard officer] (Ep. 9)Guest Role
- Fukuzawa AkiraNarahara ["Toto Heavy Industries" president] (Ep. 9)Guest Role
- Sugawara Daishi Guest Role
- Numakura Ryo(Ep. 8)Guest Role
- Sergey Vlasov[Russian language instructor]Guest Role
- Iwakawa HaruSeno Haruki [Childhood] (Ep. 1)Guest Role
- Takashima Tsuyoshi[Aquarium Staff] (Ep. 7)Guest Role
- Sunaga Chie(Ep.1)Guest Role
- Seshio[Fisherman] (Ep. 4)Guest Role
- Ando Hiroro[Shinto priest] (Ep. 1)Guest Role
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