This 2000 film has a backdrop of the Drafi Deutscher hit Marmor, Stein, und Eisen bricht, but it is put in a context of stalkerish feelings that have escalated to kidnapping.
Stephan Kampwirth, who plays Konrad (the friend), may seem familiar to some – he is a main character in the Netflix original Dark.
While this film has no obvious nudity, there are many scenes with sexual context, and the entire plot line leaves little room for any educational value. In today’s U.S. ratings, it would probably land a PG-13, but I would recommend leaving this as entertainment outside of the classroom.