In the story, a Fleet of Fog loaded with super weapons suddenly appear all over the world. Without the ability to withstand this fleet, humanity was defeated and could no longer travel the seas. 17 years after the devastating naval war, Chihaya Gunzou and his friends somehow commandeer a Fleet of Fog submarine and rename it I-401. Together with Iona, they take on the Fleet of Fog.
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Iona
MAIN
Mai Fuchigami
Japanese
Gunzou Chihaya
MAIN
Kazuyuki Okitsu
Japanese
Sou Oribe
SUPPORTING
Shinobu Matsumoto
Japanese
Narrator
SUPPORTING
Jouji Nakata
Japanese
Iori Watanuki
SUPPORTING
Minami Tsuda
Japanese
Ryoukan Kita
SUPPORTING
Atsushi Ono
Japanese
Takao
SUPPORTING
Manami Numakura
Japanese
Toujuurou Osakabe
SUPPORTING
Kouji Yusa
Japanese
Ryuujirou Kamikaze
SUPPORTING
Ryoutarou Okiayu
Japanese
Kirishima
SUPPORTING
Yumi Uchiyama
Japanese
Makie Osakabe
SUPPORTING
Sayuri Hara
Japanese
Haruna
SUPPORTING
Hibiku Yamamura
Japanese
Maya
SUPPORTING
MAKO
Japanese
Kongou
SUPPORTING
Yukana
Japanese
Hyuuga
SUPPORTING
Saki Fujita
Japanese
Shizuka Hozumi
SUPPORTING
Nao Touyama
Japanese
I-402
SUPPORTING
Nozomi Yamamoto
Japanese
Kyouhei Kashihara
SUPPORTING
Eiji Miyashita
Japanese
I-400
SUPPORTING
Rina Hidaka
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