Witch Hunter Robin is a Japanese anime series created by Sunrise. The series was licensed for North American and distribution by Bandai Entertainment. The show aired on Adult Swim beginning February 16, 2004 (it was given a second full run on Adult Swim in the Fall of 2004 before the broadcast rights were left to expire).
The series revolves around a girl named Robin Sena. Robin joined STN-J, a secret government organization, and must help them hunt down witches.