I didn't see a thread for this, so..
This series is now a manga, anime (which is in its 2nd season) AND live action (that started airing recently).
The gist of the story goes:
QUOTE
Somewhere in the vast sea of the Internet, there's a website that can only be accessed at the stroke of midnight. Known as the Jigoku Tsushin, rumor has it that if you post a grudge there, the Jigoku Shoujo will appear and drag whoever torments you into the inferno. Very little is known about the girl - all we know for sure is that she lives with her equally enigmatic grandmother, that three magical straw dolls accompany and serve her, and that whenever a posting on the Jigoku Tsushin moves her, she becomes the Jigoku Shoujo.
credit





I watched 20 episodes in one day--it's so good

Enma Ai (the Hell Girl) and her entourage of hell friends are absolute hotness.
Each episode in the anime and live action starts as a victim/attacker of the day sort, but a plot gradually develops.
Here's a fanlisting whose opening page should look familiar to those of you that have watched the show.
click