He doesn't remember who he is — only who he's looking for. In New Babel City, year 2079, a single black tower rules everything, and the discarded live in its shadow. Zero is ZN-007: the seventh and only surviving soldier of the Tianshu Group's military "Scavenger Series." Three years ago he escaped the tower; his memories were sealed by a lock, and he fell into the junkyard, his cybernetic left arm rusted dead. The arm still wakes. Whenever Zero sees Tianshu's crimson steel-claw emblem, a buried military protocol seizes his body and unleashes peak killing power — power he can't control and won't remember. With each trigger, more rust flakes away. He's getting stronger.