Robin Sena arrives in Japan to replace a fallen member of the STN-J. Engrossed in a witch hunt, the members of the team are unaware that this quiet 15-year-old is the new Hunter and brush her off. When they finally corner the Witch will they come to appreciate Robin's power?

When a suspected thief's wrecked car is pulled from the harbor, the STN-J suspect there is more going on then a mere accident. When the go to question the suspect, however, he flees in his car, crushing Karasuma's vehicle with a powerful blow in the process. But, was it the thief doing the crushing or a more sinister force?

As Robin bides her time hiding from the Factory, she takes on two jobs: as a bike messenger for Nagira's Law Firm and as a babysitter for an unusual girl. While delivering packages one day, she spots Dojima being attacked by a Witch and his gang. After saving Dojima, she learns that the STN-J is seriously undermanned. Dojima begs Robin for help. Can Robin risk being exposed to the Factory by helping her friends at the STN-J?

Robin's mentor from Italy, Father Juliano, has made a sudden visit to Japan to see her. She confronts him about her real identity; who, or what, is she? Father Juliano gently revels to Robin her own true nature. Meanwhile, the STN-J Team and Nagira plan to stage an assault on the Factory.