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Arpeggio of Blue Steel

蒼き鋼のアルペジオ

In the early 21st century, humanity faces a dual catastrophe. Rising sea levels have submerged much of the world's land, and a mysterious, unmanned armada known as the Fleet of Fog has seized control of the oceans. Armed with incomprehensible technology, these sentient warships effortlessly crushed all naval resistance, imposing a global blockade that has severed connections between continents for seventeen years.

Amidst this despair, a glimmer of hope emerges with the I-401, a powerful Fog submarine that has defected to the human side. Its core is manifested as a young girl named Iona, a Mental Model who now answers to Captain Chihaya Gunzou and his crew. As the only vessel capable of challenging the Fog's dominion, the I-401 and its unique crew embark on a desperate mission to break the blockade and deliver a potential weapon that could turn the tide of war for a humanity on the brink.

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