The storyline is wonderful. The anime itself is mainly episodic, and each episode focuses mainly on one person, and the suffering they're experiencing due to one person. As you read more into the character's lives, and just how badly they're treated, you, yourself, will want to see that red string pulled, just so that person can suffer what he/she's had coming to them, and you'll be anxious to see their horrifying experience before they're ferried off to Hell by Enma Ai, the Jigoku Shoujo.
You won't always see the the person's experience in hell, nor will you always see the person being carried off by the Jigoku Shoujo. The main experience of this anime is coming to know and feel sorry for the characters that are desperate enough to call forth the Jigoku Shoujo to end their suffering. If you're looking for humor, this isn't a series to watch. Though it does have it's moments, it's more for the people that enjoy supernatural and paranormal related anime, such as Ghost Hunt and XXXHolic. In fact, if you enjoyed either of these, though the two of them are more humorous than anything else, I recommend putting Jigoku Shoujo, and Jigoku Shoujo Futakomori on your plan-to-watch list.
Anyway, this anime is one of those where you'll either love it or hate it. This is a series that got me hooked on the first episode, but if you aren't enjoying it by the third or fourth, then you most likely won't get into it. I hope this review has helped you and convinced you to look into this wonderful anime. Have fun and enjoy.
