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
Dragon Ball Z: Dead Zone
Movie
41m
Eureka Seven: Astral Ocean
TV
24m
Lupin III: Napoleon's Dictionary
Special
90m
Mikagura School Suite
TV
24m
Nobunagun
TV
24m
KADO: The Right Answer - Ninovo
ONA
23m
One Punch Man 2nd Season Commemorative Special
Special
24m
Fireball
TV
1m
Space Battleship Yamato: The New Voyage
Special
95m
Rewrite
TV
24m
Zenonzard The Animation (OVA)
ONA
27m
Gad Guard
TV
25m