Pitch Black Affection

The horror story centers on cram school teacher Toshihiko Katayama, a stunningly handsome man, used to being the center of attention. One day, a woman with long black hair begins to stalk him, starts harassing Toshihiko's students and colleagues, and a strange phenomena attacks him. Toshihiko finally decides to visit a company that handles paranormal cases, owned by his friend from his school days, Rumi Sasaki.

(Source: Anime News Network)