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Huaxia boys dream of being paired with a girl so they can become pilots of chrysalises, the giant mechanized ones used to fight the creatures that lurk on the other side of the Great Wall. The highest honor for a girl from Huaxia is to be selected as a pilot-concubine, even if it means certain death. When her sister dies in a chrysalis, Zetian takes over from her to avenge her. The rematch is quick, brutal and...unexpected, and Zetian earns the nickname of the Iron Widow; a feared female pilot who sacrifices men, and not the other way around, to power the chrysalises. To tame her disturbing but invaluable mental strength, she is paired with Li Shimin, the strongest and most controversial pilot in the entire country. But now that she has tasted the power, Zetian won't give in so easily. She'll harness her gifts and her infamy to survive attempt after attempt to end her life, until she finds out why the pilot system relies so heavily on destroying girls' lives...and raze it to the ground forever.