Guardian (ガーディアン, Gādian) is the 17th chapter of Clockwork Planet manga series.
After Naoto, RyuZU, and AnchoR drop to their apparent death, Marie and Vainney make their way out of the factory. On the way, Marie languishes on her role in the death of Naoto. They arrive at a hotel to rest, where Marie contacts Conrad about a potential purge of the Tokyo Grid and promtly afterwards vents on the army's selfishness. Later, Vainney asks her what would she feel if she would cry, and she answers that she wouldn't forgive herself for breaking. Vainney concludes that her genius comes from her own merciless self-discipline and if she were to regress, she would be just like another average person, the equivalent of death for her. She plans to first strike the head of Grid Mie.