Puella Magi: Lost

it has been months since the attack of Walpurgis Nacht on the city. Heiri Shō, the last standing magical girl of her group was lost by the end of the battle, but something is amiss in Mitakihara.

As Heiri wanders the city, she seems to be a target for the magical girls that reside there, but she doesn't know why. Is she the new face for evil? Or is she being targeted for another reason?