I think there were practical reasons behind making this movie. Mainly shoot us a picture which the Polish public TV would have always at hand to play around the Second World War outbreak anniversary. And put some cutesy teens in it, so the young ones would have someone to identify with.
The cast is fairly decent. Most of the faces are recognizable for a Polish TV viewer and many of them are good actors. The message of the movie is also important - before the war the young people lived normal and often nice life, had their ambitions and their little crushes. Just like you would. The relations between them are also neatly portrayed.
However, all of that put together gives a result far from fascinating. It's neither very humorous nor very dramatic. It just show some people and some relations between them and a bit of what matters to them just a few days before the outbreak.
Of course the young people couldn't have a clue about what was coming, but yet, the mysterious imperative "You shall lose your virginity before 1st September" seemed to be present throughout a movie. And no, it didn't add that much attractiveness to it all.