Hokenshitsu no shinigami manga

Hokenshitsu no Shinigami summary:

Hadesu Sensei is no ordinary middle school nurse. In fact, many students believe he is a shinigami. His excessive friendliness and eagerness to win his students' affection does little to offset his terrifying appearance. But, fortunately for this middle school, Hadesu Sensei is an expert at extracting "byouma", demons of disease, from possessed students! A one-shot preceded the serialization. It was published in the Akamaru of Spring 09