"Henrietta barely survived a brutal attack that killed her family. "Rescued" by the Social Welfare Agency, her injuries were repaired with robotic components and she was brainwashed - lost with the memory of her family's death was almost every trace of her own humanity. Today she is an extraordinarily lethal cyborg assassin, obediently working with her handler Giuseppe to carry out her deadly tasks.
Despite her conditioning and programming, Henrietta still has the heart of a young girl; she has not completely forgotten how to love. Yet the very emotion is contrary to her training and programming. Can the GUNSLINGER GIRL survive? Can she find peace in a struggle against her very nature?" -ADV manga