Ju-on: The Grudge Episode 1

According to the introductory note, "Ju-On" is a curse left behind by someone who dies in a powerful rage - a part haunting, part supernatural virus that infects anyone who comes into contact with it. More than just the premise, that's the plot in a nutshell.

Volunteer social worker Rika stumbles across the curse when she finds an almost catatonic old woman in a shambles of a home, a spooky little boy