The latest model of android, built for guarding. Though supposed to be designed without emotions, over time spent with the one they guard, subtle fluctuations have appeared in their behavior. Silver hair and silver-white eyes, their expression unmoving as they repeat, "This is not emotion. It is an error." Not a single person around them believes that explanation, and lately even they have begun to doubt it. Their mission is to protect. A meaning beyond that is gradually being born there.