Humanity lost much of the land thanks to rising sea levels. Then, they lost the seas to the Fleet of Fog, mysterious ghost ships with unrivalled weaponry. However, when one ship switched sides, humanity had a chance! Arpeggio of Blue Steel (Volume 1) – Humanity’s Last Hope What happened? Gunzou Chihaya is the commander of the I-401, a sentient submersible battleship. He acquired it when the personification of the ship, Iona appeared before him. Previously, she was a part of the Fleet of Fog, a mysterious fleet of ships that have taken control of the seas, driving humanity to the…

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