Hitozuma kyôshi: Reipu momi shigoku (2010)

Shihori, a female teacher at a part-time high school, is married to an unsuccessful writer. When Shihori learns of the unusual relationship between Miki, an outcast in her class, and the vice-principal, Tanemura, she tries to report Tanemura to the board of education. But then, retaliation against Shihori begins...