i found "Unpleasant Surprise Pt.1" on youtube.
HSP and in my opinion,one of the best otk spanking in all movies i have gotten recently.
according to what an official site says,
Student Maria falls in love with her new teacher and she tries to get her attention. She has a chance to get a spanking from the teacher, but to the girl's horror, it is ver hard - instead of pleasant.
...So that's way Maria seems to get a good otk spanking in this episode.