Hullmetal Girls by Emily Skrutskie
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Featured on The Thread: Muscle and bone meet machinery in 'Hullmetal Girls'
Aisha Un-Haad would do anything for her family. When her brother contracts a plague, she knows her janitor's salary isn't enough to fund his treatment. So she volunteers to become a Scela, a mechanically enhanced soldier sworn to protect and serve the governing body of the Fleet, the collective of starships they call home. If Aisha can survive the harrowing modifications and earn an elite place in the Scela ranks, she may be able to save her brother.
Key Tanaka awakens in a Scela body with only hazy memories of her life before. She knows she's from the privileged end of the Fleet, but she has no recollection of why she chose to give up a life of luxury to become a hulking cyborg soldier. If she can make it through the training, she might have a shot at recovering her missing past.
In a unit of new recruits vying for top placement, Aisha's and Key's paths collide, and the two must learn to work together--a tall order for girls from opposite ends of the Fleet. But a rebellion is stirring, pitting those who yearn for independence from the Fleet against a government struggling to maintian unity.
With violence brewing and dark secrets surfacing, Aisha and Key find themselves questioning their loyalties. They will have to put aside their differences, though, if they want to keep humanity from tearing itself apart.