Arpeggio of Blue Steel Vol. 15

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It's been seventeen long years since a mysterious, unmanned fleet of powerful vessels that appeared out of nowhere took control of the oceans. Now, a weapon powerful enough to damage the fleet's vessels has finally been invented, and there's just one way of getting the critical information and prototypes from Japan to America, where the weapon can be produced. 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. more