About Arpeggio of Blue Steel
Due to global warming and rising sea levels of the early 21st century, humanity lost much of the Earth's landmass. At the same time, fleets of powerful sentient ships known as "Fleet of Fog“ mysteriously appear all over the world. Loaded with super weapons, they easily vanquished the world's naval forces; imposing a worldwide naval and aerial blockade, and thus preventing humanity from traveling across the seas.
In the year 2039, 17 years after this devastating naval war, Chihaya Gunzou and his crew , the Blue Steel fleet are aboard the I-401, a former Fleet of Fog submarine. Together with the humanoid Iona, they take on the “Fleet of Fog”.