 If you liked
Jigoku Shoujo
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 ...then you might like
Miracle☆Train: Oedo-sen e Youkoso
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In both Jigoku Shoujo and Miracle Train they deal with a new situation/problem every episode. The dissimilarities are that in Jigoku Shoujo they don't really solve the problems, but just punish people for what they did, while in Miracle Train there is a group of boys who are set on solving the problems girls have. And Jigoku Shoujo has a more dark feeling to it than Miracle Train has.
Even though I think that if you like one of them, you could like the other too.
While both series are very different from each other and have no correlation to each other, they both focus on a different character's problem each episode.
To put it simply the main character for that certain episode is helped by the show's main cast in the problems they have.
However, Jigoku Shoujo has a much more violent method of solving a character's problem. While Miracle Train uses sex appeal and a more peaceful or appropriate method of solving problems.