蒼き鋼のアルペジオ [Aoki Hagane no Arupejio] [Arpeggio of Blue Steel]

In Arpeggio of Blue Steel, a mysterious alien fleet of sentient warships known as the Fleet of Fog has blockaded humanity's oceans, but one of their own—the submarine I-401—has defected with her humanoid avatar. This long-running sci-fi series from Shōnen Gahōsha, helmed by the collective Ark Performance, blends naval combat with artificial intelligence and political intrigue as a ragtag crew challenges the Fog's dominion. Its distinctive take on sentient warships and high-stakes strategy has made it a standout in modern manga.