Little Red Riding Hood (1968)

Teenage Anja runs away from her reform school with her friend Tarja. Anja starts dating Hannu and finds herself a job, but one day she doesn't show up but goes to see a middle-aged airline pilot she's met earlier. She quits her job, spends her days dividing her time and emotions between Hannu and the pilot, until she finally decides to go back to the reform school voluntarily.