A witch calls Robin back to Walled City to confront her with ancient knowledge. A hacker attacks the STN-J system as the agents search for Robin. Though Robin is safe, her encounter leaves her with an unknown relic, as well as questions not just about STN-J and hunters, but about Robin herself.

Amon and Robin go on an unsuccessful hunt. An unseen enemy shoots at Robin with witch-slaying bullets but Amon denies the attack. Secretly, Robin turns over a cartridge casing to Michael to study. Soon, not even Robin's home is safe, as those that hunt her attack those close to her.