I don't feel like I need to explain Jigoku Shoujo universe and rules, since there are a lot of other reviews that will give it to you. Here I'll try and focus on what makes this anime unique for me and triggers emotions almost instantly when rewatching episodes that I saw for the last time more than 10 years ago.
First of all, it shows the worst of human kind, going sometimes in the borderline of what is belieavable human behavior (sometimes causing you to think "why doesn't this girl tell her parents about this situation?" or "why someone doesn't call the police?") but overall OK level of "out of reality" situations for you to enjoy.
Second, some episodes will connect with you. DEEPLY. It's impossible for you to go through the whole thing and not feel specially connected with at least one of the short stories. I myself cry like a child everytime I rewatch episode 23, since I have a strong sense of justice and feel personally ofended by the stuff that happens on this episode.
Last, the last episodes! I LOVE stories that will try and explain the ORIGINS of their main characters and this for me was ABSOLUTELY AMAZING. Enma Ai's backstory gives me chills up to this day, made my GF who's not even a great anime fan cry and think about it for days. It ties up the whole season pretty well and left me with a sense of "ALRIGHT, WHAT COMES NEXT?" to search and find Futakomori already drooling for the action and new stories.
Overall: 8/10 because even though I LOVE it I need to be fair to Futakomori which is a better season and is a 9 for me (and the only 10 in anime being Clannad After Story).
If you reached this far and still haven't watched it, don't waste anymore minutes and go for it!
