Tairaku is a high school teacher in a school full of bad apples, and as
tiring as his life may already be, a chance meeting with a young girl is
about to throw it into chaos. His home life, his school life, and his
tentative relationship with a fellow teacher whom he has a crush on, are
destined to teeter on the brink, thanks to this one young student. The
girl in question is called Shirakaba Aya and her father has the utmost
confidence that Tairaku will behave like a proper adult while they are
living together... But Aya has the utmost confidence that Tairaku won't
be able to keep his hands off her, even if she has to force him to do
so...
There was also 2 OAVs under the name Very Private Lesson.