Kaibutsu-san

Tanemura is just a regular high school boy, but when he is assaulted by demons, he is saved by a girl in his same school, Tateeboshi Suzuka. She is a very mysterious girl and no one really knows much about her except for the fact that she is referred to as the shadowy master. Tanemura finds out that she is in fact an exorcist and has been eliminating the demons that plague the town he lives in. The more Tanemura gets involved with Teteeboshi, the more dangerous demons he encounters.