A movie directed by Shuji Fukasaku and starring Takeshi Kitano as a supervisor of a class of 14-15 year old students. The story is set in a hyper-violent future where the previously mentioned students are sent to an island. Each has an explosive collar wrapped around their throat. If more than one of them are left alive at the end of three days, all of the collars detonate. The only way to live, is for one of the students to kill all of their classmates.

Truly disturbing.

The students are portrayed as scared teens trying to survive, and this is no small component of the shock value of this movie. Toei wanted to release the movie with a "PG" rating, but instead it was given an "R-15", preventing anyone under the age of fifteen from seeing the movie in Japan. In fact, it's been quite the controversy in Japan, even causing Governer Ishi to try to stop the distribution of the film. "You cannot show young people how to kill others!"

The trailer for the movie is available on the net, and gives an idea of the general mood of the film.