Anyway, WHR is about this 15 year old craft user, not a witch, who hunts witches down because they are two powerful.  All the rest of the hunters were these things called Orbo that blocks a witch's attack.  Robin doesnt use them.  And when they hunt instead of killing the witches they bring them to a place.  It turns out that this place is actually testing witches to make a stronger Orbo and Robin is the one that is meant to protect the witches, after she learns the true power that she has.  Of course Amond and the rest of the group join up to help Robin.  I am not going to give you all the spoilers, sorry, you are just going to have to watch the anime!