Wahrheit oder Pflicht(2005)

German schoolgirl fails out of high school, doesn't tell her parents and lives this lie for an entire school year

Annika's life and experiences as a young woman include peculiar sex, an unfortunately cold best friend, a terrible tutor/boyfriend, and a sensible and beautiful boyfriend (Kai). Her family life and lie collide in such a way that it is impossible for her to tell the truth even when she desperately wants to.