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
Noir
TV
24m
One Piece: Adventure of Nebulandia
Special
106m
Tetsujin 28
TV
25m
Birdy the Mighty: Decode OVA
OVA
27m
Zoku Touken Ranbu: Hanamaru
TV
24m
Sword Art Online
TV
23m
Taiyou no Kiba Dagram
TV
23m
Tokyo Ghoul: "Pinto"
OVA
24m
Cuticle Detective Inaba
TV
23m
Gatchaman Crowds Insight
TV
23m
Heavy Object
TV
23m
High School DxD Hero
TV
23m