Immorality / In no Houteishiki

The main character of the anime, Sayako, is an experienced special agent of a secret military organization. She has a new assignment to fulfill: to find out where drugs are coming from in the region.
Sayako infiltrates Mikami University undercover as a teacher. There she attracts the attention of a student named Yunichi Yano, who notices her uncanny resemblance to his late mother.
The student is keen on filming everything he sees, and Sayako agrees to take up his challenge. Now she has to simultaneously continue her investigation and deal with Unichi, who is constantly following her.