Main Role
- Satsukawa AimiNishina ShihoMain Role
- Senga KentoNishina KosukeMain Role
Support Role
- Hashimoto ManamiMorio Yuko [Shiho's mom friend]Support Role
- Kikawada MasayaMorio Shinji [Yuko's husband]Support Role
- Isomura AmeriMorio Chie [Yuko and Shinji's daughter]Support Role
- Yanagi YurinaAndo Chiharu [Shiho's mom friend]Support Role
- Wada MasanariAndo Yuki [Chiharu's husband]Support Role
- Akutsu ShomaAndo Keita [Chiharu and Yuki's son]Support Role
- Nonami MahoKosaka Yoshie [Shiho's mom friend]Support Role
- Ishigaki YumaKosaka Tsuyoshi [Yoshie's husband]Support Role
- Matsui ItsukiKosaka Takashi [Yoshie and Tsuyoshi's son]Support Role
- Saito TomaKosaka Shota [Yoshie & Tsuyoshi's son]Support Role
- Itaya YukaKubozuka Shoko [Clinical Psychologist]Support Role
- Hiraoka YutaKubozuka Yoichiro [Shoko's husband, Owner of "Night Aquarium"]Support Role
- Osada SeiyaOshida Hajime [Doctor, Participant of the "Night Aquarium"]Support Role
- Sawai MiyuuOshida Hana [Hajime's wife, Participant of the "Night Aquarium"]Support Role
- Matsumoto LeoKashiwagi Tomoya [Mysterious medical student that Chiharu met on SNS]Support Role
Guest Role
- Watanabe Sho(Ep. 1)Guest Role
- Mitani YumiMorio Shizue [Shinji's mother] (Ep. 4-5)Guest Role
- Mochizuki KeinaAkizuki Hana [Yuki's colleague at work] (Ep. 7-8)Guest Role
- Sato Nori[Female customer A, Participant of the "Night Aquarium"] (Ep. 8)Guest Role
- Nitta SachikaKoseki Haruna [Daisuke's girlfriend] (Ep. 10)Guest Role
- Niihara TaisukeSasai Daisuke (Ep. 10)Guest Role
- Donoshita Sara[Nursing home staff] (Ep. 10)Guest Role
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