Robin and Dojima work undercover as waitresses at Harry's while searching for Yutaka Kobari, a witch who disappeared two years ago and also the son of Master, the owner of Harry's. But they are not the only ones searching for him. Will father and son be reconciled before Yukata's past catches up with him?

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.