In the year 2039, the drastic effects of global warming have caused sea levels to rise, resulting in major loss of land. To ensure humanity learns its lesson, a fleet of powerful warships equipped with advanced weaponry emerges, causing overwhelming defeat for naval forces throughout the world. Calling themselves the Fleet of Fog, each ship has a "Mental Model," a humanoid avatar which represents the ship's heart, its "Union Core." Each model has a different personality but all follow an unknown authority known as the Admiralty Code, who have implemented a blockade to prevent humans from traveling across the sea.
Seventeen years after the blockade, Gunzou Chihaya, a National Marine Academy alumnus, stumbles upon I-401 and its Mental Model, Iona, who sides with mankind for unknown reasons. Utilizing this newfound hope of achieving peace for humanity, Gunzou and his friends form a group of privateers, known as the Blue Steel, as they set out on a dangerous journey.
[Written by MAL Rewrite]+ More
Characters & Voice Actors

Iona
Main
Haruna
Supporting
Hozumi, Shizuka
Supporting
Hyuuga
Supporting
I-400
Supporting
I-402
Supporting
Kamikage, Ryuujirou
Supporting
Kashihara, Kyouhei
Supporting
Kirishima
SupportingRecommended for you
Magilumiere Co. Ltd.
TV
24m
TRILLION GAME
TV
24m
KamiErabi GOD.app Season 2
TV
22m
Perfect World Movie
ONA
36m
Attack on Titan: The Last Attack
Movie
144m
Heavenly Brick Hero
ONA
15m
Hidden Sect Leader
ONA
11m
Slay The Gods
ONA
25m
Pop Pop City
ONA
10m
One Piece Fan Letter
Special
24m
One Way or Another
ONA
19m