My Deer Friend Nokotan

Torako thought she had successfully buried a wild past to become a normal high school honors student, with none of her classmates aware of her delinquent roots. But that all changes when she discovers Nokotan, a new transfer student with antlers, tangled up in power lines and being attacked by birds. Whatever she is, Torako may regret helping her, since Nokotan can smell the former delinquent on her. Now a punky past and a monster girl have crashed into Torako's life in this hilarious (and chaotic) high school comedy. <em class=de-emphasized>(from manga)</em>

Synopsis from Anime News Network