Aoki Hagane no Arpeggio: Ars Nova - Full Series Information, Trailer & IMDb Reviews
Watch Aoki Hagane no Arpeggio: Ars Nova online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.
In the story, a Fleet of Fog loaded with super weapons suddenly appear all over the world. Without the ability to withstand this fleet, humanity was defeated and could no longer travel the seas. 17 years after the devastating naval war, Chihaya Gunzou and his friends somehow commandeer a Fleet of Fog submarine and rename it I-401. Together with Iona, they take on the Fleet of Fog.