Hell Teacher Nube OVA

TV series

Starring Toshiyuki Morikawa, Chieko Honda, Michiko Neya, Kazunari Tanaka

Nube fights a demon who resides inside walls, confronts a young spirit who wants her harmonica back, and in the end he must battle a powerful demon named Zekki - brother of Baki, demon that resides within Nueno.