Arpeggio of Blue Steel: Ars Nova - S01

In 2039, the drastic effects of global warming caused sea levels to rise, leading to major loss of land. To make sure humanity learns its lesson, a fleet of powerful warships equipped with advanced weaponry appeared, overwhelming and defeating naval forces around the world. Calling themselves the Fleet of Fog, each ship has a "Mental Model," a humanoid avatar that 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, which has set up a blockade to stop humans from traveling across the sea. Seventeen years after the blockade, Gunzou Chihaya, a National Marine Academy alumnus, comes across I-401 and its Mental Model, Iona, who sides with mankind for unknown reasons. Using this newfound hope of achieving peace for humanity, Gunzou and his friends form a group of privateers called the Blue Steel, and they set out on a dangerous journey.