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Umihotaru's primary photo

Umihotaru (Season 1, Episode 6)

TV Episode | 24 min |Animation, Adventure, Sci-Fi

Leaving a storm in Tokyo Bay's Aqua-Line behind, the girls finally arrive in Umihotaru. They explore the area in the darkness until the rain stops.

Composer

Status

Edit Released

Release date

Nov 8, 2025 (United States)

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Cast	+ Add Cast
8 cast members

Name	Known for
Konomi Inagaki Yoko (voice) Yoko (voice) See fewer	Mobile Suit Gundam: The Witch from Mercury (2022)
Miyu Tomita Airi (voice) Airi (voice) See fewer	Made in Abyss (2017)
Haruka TomatsuChitose (voice) Chitose (voice) See fewer	Sword Art Online (2012)
Saeko ÔkiSpectator (voice) Spectator (voice) See fewer	Tokyo Mew Mew New (2022)
Souhei HorikaneSpectator (voice) Spectator (voice) See fewer	Demon Slayer: Kimetsu no Yaiba Infinity Castle (2025)
Yûki HiroseHigh School Girl (voice) High School Girl (voice) See fewer	Mobile Suit Gundam: The Witch from Mercury (2022)
Reo OsanaiHigh School Girl (voice) High School Girl (voice) See fewer	Tokyo Mew Mew New (2022)
May TachibanaHigh School Girl (voice) High School Girl (voice) See fewer	Assassin's Creed Shadows (2025)