Every episode is self-contained short stories in which the series narrates the suffering of a different individual caused by one or more antagonists. In general during each arc, the protagonists' dramas are explained in detail from the start of their grudges, through the escalation of their torment until it becomes unbearable and they resort to accessing the Hell Correspondence website.
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Although in general, the client gives the protagonist a chance, he or she usually ends up pulling the string on his or her doll and sending the antagonist to hell. Once they have pulled the string, before taking the antagonist to hell, Ai Enma punishes the person for his or her sins with the help of her companions.

"Hell Girl's suspense always keeps me excited. It makes me want to watch every episode per day, but not a lot of episodes per night"

en.wikipedia.org/wiki/Jigoku_Shoujo
Jigoku Shoujo (Hell Girl)
