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Arpeggio of Blue Steel

Arpeggio of Blue Steel

蒼き鋼のアルペジオ

In 2039, rising sea levels due to global warming have reshaped the world. A mysterious fleet of advanced warships known as the Fleet of Fog appears, easily defeating all naval forces and blockading the seas. Each ship possesses a humanoid avatar called a Mental Model, linked to its core, and all follow the enigmatic Admiralty Code.

Seventeen years later, Gunzou Chihaya, a former National Marine Academy student, discovers the submarine I-401 and its Mental Model, Iona, who has sided with humanity for unknown reasons. Together with his friends, Gunzou commandeers the vessel and forms a group of privateers called Blue Steel. They embark on a dangerous mission to challenge the Fleet of Fog and break its stranglehold on the world's oceans.

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