I found (sample movie? from) "女子校生過激尻ビンタ!〜フルスイング スパンキング 和太鼓〜"(lit. hard bottom spanking for high school girls - a full swing spanking wa-daiko)uploaded on spankwire.
In this video,some school girls are spanked by mask man after they confessed bad behavior.
Japanese Schoolgirl Ass Spanking brought to you by Spankwire
and this video might be originally from jade-net,
http://www.jade-net-home.com/products/5039