In a similar vein to Audition or Battle Royale, this Japanese "horror" film doesn't contain any supernatural creatures or masked axe-murderers, but is nonetheless terrifying.

The fear comes from the relentless portrayal of the harm human beings can be prepared to do to each other. In this case, a schoolteacher played by Takako Matsu takes her revenge on two teenage students she believes have murdered her daughter - not through violence but through extended psychological torture which her whole class eventually becomes complicit in.

In the course of the movie we learn more about the two killers and their motivations for doing what they did. The whole thing is filmed beautifully, with picturesque slow-motion sequences which only serve to highlight the uglyness of what is happening to the characters.