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Arpeggio of Blue Steel

Seventeen years after humanity's naval forces were shattered by an enigmatic armada of mist‑shrouded warships, a handful of survivors discover a dormant submarine hidden within the fog. Led by the daring Chihaya Gunzou, they seize the vessel, christen it I‑401, and partner with the enigmatic AI known as Iona to challenge the otherworldly fleet.

The series blends high‑octane naval combat with speculative technology, delivering a gritty yet hopeful tone as the crew navigates a world where the seas have become hostile and mysterious. Its distinctive mix of tactical battles, AI companionship, and a post‑war setting sets it apart from typical sci‑fi action fare.