Arpeggio of Blue Steel

In a future where humanity has been decisively defeated by a mysterious, sentient fleet of warships known as the "Fleet of Fog," the remnants of civilization cling to coastal cities, cut off from the rest of the world. Communication and travel across the seas have become relics of the past. Hope arrives in the most unexpected form: a renegade Fog submarine, the I-401, commanded by a young man named Gunzou Chihaya and his crew, a small team of dedicated, resourceful individuals determined to reclaim the oceans. Their unlikely alliance with Iona, the I-401's "Mental Model"—a humanoid avatar of the vessel's AI—presents humanity's last, best chance. Together, they embark on a perilous mission to deliver a weapon that could turn the tide against the overwhelmingly powerful Fleet of Fog, navigating treacherous waters and facing formidable adversaries who possess advanced technology and their own complex, evolving consciousness.

✦ AI-drafted summary