Schoolgirl Report 9 revolves around two carloads of kids who"ve just left a drinking party, engage in a high-speed race and predictably have a wreck. During their investigation, the police reflect on the histories of several of the teens involved in the accident: Scene 1: Petra Klassman (Gina Janssen) has just turned 18, and against her parents" wishes, decides to marry Horst, an auto mechanic. Their honeymoon is a bust, thanks to a nosy old innkeeper. And marital bliss is also elusive, as the differences in their social and intellectual levels become more evident. Within a few months, Petra is back in class, a single schoolgirl once again. Scene 2: Tessy Van Straaten relates the tale of her wealthy classmate, Lilo (Puppa Armbruster), who hosts an orgy for her fellow students while the folks are out of town. The virginal Tessy reluctantly agrees to go, despite efforts by an older classmate, Paul Bellmann, to dissuade her. She is surprised, therefore, when Paul shows up at the party ...