Lesson of the Evil
悪の教典 (original)
A popular high school teacher concocts an extreme plan to deal with the rise of bullying and bad behavior among the student body.
Starring Hideaki Ito, Fumi Nikaido, Shota Sometani, Kento Hayashi, Kodai Asaka, Erina Mizuno, Takayuki Yamada, Mitsuru Fukikoshi, Takehiro Hira, Uji Kiyotaka
Watch "Lesson of the Evil" on Amazon released in 2012. It's a mystery and thriller movie, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.