Iron Widow

In Iron Widow, the girls of Huaxia risk their lives piloting Chrysalises, giant robots that fight aliens beyond the Great Wall. When Zetian offers herself up as a concubine-pilot to avenge her sister's death, she emerges from the cockpit unscathed, labeled an Iron Widow who can sacrifice boys to power up Chrysalises. Now paired with the most controversial male pilot in Huaxia, Zetian won't back down and will use their combined power to uncover the system's misogyny and prevent more girls from being sacrificed.