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
Robot Carnival
OVA
91m
The Perfect Insider
TV
23m
Witch Hunter Robin
TV
25m
Big Windup!
Special
24m
Witchblade
TV
24m
One Piece: The Curse of the Sacred Sword
Movie
95m
The Royal Tutor Movie
Movie
1m
Plastic Neesan
ONA
28m
Ajin OVA
OVA
21m
Suite Precure
TV
24m
The God of High School
TV
23m