Composer
Director
Screenwriter
Main Role
- Ishihara SatomiNagisa MioMain Role
- Ayano GoHasuda RintaroMain Role
Support Role
- Hashimoto JunKamoi Tadashi [Mio's uncle / Laboratory manager]Support Role
- Otani RyoheiHasuda Kotaro [Rintaro's older brother / Managing director of "Hasuda Trust"]Support Role
- Watanabe KeisukeHasuda Eitaro [Rintaro's younger brother / "Hasuda Trust" Resort Development Headquarters employee]Support Role
- Imada MioMiyamae Aika [Mio's friend / Project researcher]Support Role
- Takahashi TsutomuSomeya Daigo [Professor specialising in fish ecology]Support Role
- Mizusawa ShingoShiiki Takuma [Associate professor specialising in marine renewable energy]Support Role
- Kaga TakeshiHasuda Taro [Father of the Hasuda brothers / Chairman & President of "Hasuda Trust"]Support Role
- Fujimori ShingoTsurukawa Yusaku [Rintaro's best friend / Public relations department]Support Role
- Kakei MiwakoYamauchi Karen [Resort Development Headquarters Planning Support Division member]Support Role
- Matsukuma TsurumatsuKazama Midori [Resort Development Headquarters Planning Support Division chief]Support Role
- Fukuyama ShodaiMr. Enishi [YouTuber]Support Role
- Kirishima ReikaHasuda Arisa [Rintaro's mother]Support Role
- Uenoyama YumekiHasuda Rintaro [Young]Support Role
- Nagano SoraHasuda Kotaro [Young]Support Role
- Iwakawa HaruHasuda Eitaro [Young]Support Role
- Wakamoto Norio[Spotted moray eel] [Voice]Support Role
- Izumi RikaOmiya Haruka [Rintaro's sister-in-law]Support Role
- Hosoya YutaSakai DaisukeSupport Role
- Nishimura MiyuYabe NanaSupport Role
Guest Role
- Sakura Ichika[Tadashi's partner] (Ep. 1)Guest Role
- Yoshida Oolongta["Twilight TV" MC] (Ep. 1, 3, 7)Guest Role
- Kote ShinyaDavid Chan [Chairman of "Benjamin Star Hotel"] (Ep. 2)Guest Role
- Hotta Mayu Guest Role
- Kaji Yuki[Fourspine Sculpin] [Voice] (Ep. 3)Guest Role
- Miyazaki TomuMakabe Akio [Yukino's uncle] (Ep. 3)Guest Role
- Hanazawa Kana[Moon Jellyfish] [Voice] (Ep. 5)Guest Role
- Terada AzukiYuri [Little girl at aquarium] (Ep. 5)Guest Role
- Koshimura Tomokazu[Reporter] (Ep. 5)Guest Role
- Fujiyoshi KumikoTomiura Fumi [Director of "Tomiura Clinic"] (Ep. 6, 8)Guest Role
- Yamada MeikyoSanada [Professor at Shibaura Marine University] (Ep. 6-8)Guest Role
- Nagakura DaisukeKatagiri [Scientist] (Ep. 6-8)Guest Role
- Ogata Megumi["Kameda"] [Voice] (Ep. 6)Guest Role
- Oomizu Yousuke[Courier] (Ep. 6)Guest Role
- Horibe KeisukeTakayanagi [Director of weekly magazine "High Tide"] (Ep. 7)Guest Role
- BOBHishida [Takayanagi's subordinate] (Ep. 7)Guest Role
- Sumida TakashiKondo [Attendees at the faculty meeting of Shibaura Marine University] (Ep. 8)Guest Role
- Tanaka Hanna[Little girl] (Ep. 9)Guest Role
- Tsuchida Ryo(Ep. 9)Guest Role
- Nishina Mirei(Ep. 9)Guest Role
- Komagine KiitaVisitorGuest Role
- Kawai YasushiHiramatsu Yuki (Ep.1)Guest Role
- Yuki Hina(Ep. 5)Guest Role
- Nakagawa Akira[ER team member] (Ep. 4)Guest Role
Unknown
- Furuya Kazuki Unknown
- Kunimatsu Airi Unknown
- Shimizu Kotoko Unknown
- Morozumi Renon Unknown
- Eguchi Sota Unknown
- Oguma Taiki Unknown
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