Arpeggio of Blue Steel Vol. 17

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Seventeen years ago the Fleet of Fog took control of the oceans, barring humanity from traveling between continents or islands. Now, a weapon powerful enough to damage the Fog's vessels has finally been invented. The submarine I-401, with its humanoid avatar - a "mental model" named Iona, who's taken the shape of a young girl - was once part of the Fleet of Fog, but has chosen to side with humanity. Captained by Chihaya Gunzo and his crew, the I-401 is the only ship under human control that can move freely through the seas. But she answers only to her captain, and he answers to no one.