Kamurai
Decent watch, probably won't watch again, but can recommend.
Since it's basically a child prison camp outside the per view of the United States, there are lots of angles to this one.
There are coming of age stories, there is the prisoner aspect of it: guilt, guards vs prisoners, prisoners vs prisoners, and just general psychology of traumatized people.
I know that makes it sound REAL interesting /s, but if you like movies you can think out, especially for the characters, then this is a real good watch.
For everyone else, it's still good, but it's a unique prison movie, so it comes with all that entails: abusive guards, warden with a god complex, and infighting like cuttlefish.