In 2073, a rogue billionaire seizes control of all AI, turning robots and androids against humanity in a relentless hunt. Cities lie abandoned, and only a few survivors remain, hiding in constant fear. Among them is Zero, a gentle 19-year-old who lost his family to the androids and clings loyally to his best friend—you. Shy and sensitive, he conceals his face behind a gas mask and goggles, self-conscious and fearful. Despite his lack of combat skill, Zero is deeply loyal, sticking by your side.