Type: Horror, Mystery, Supernatural
Most episodes are self-contained short stories in which the series narrates the suffering of a different individual caused by one or more persons that have done them wrong. In general during each arc, the main "clients'" dramas are explained from their grudges they have from their tormentors, and they resort to accessing the Hell Correspondence website to get their own justice. It can only be accessed by a person who is truely serious about their avenging their justice, and at a particular time only. They can choose to make a pact, with Ai Enma, the mysterious entity bound to the underworld, there to service their needs. A doll is given for her services, its neck tied with a red string. Pull the string, and the deal is made. But it comes with a price every time.
In the first season, the story soon follows a journalist named Shibata Hajime, a former blackmailer, and his daughter Tsugumi who shares a strange connection with the Hell Girl as they investigate the truth behind the Hell Girl. In the second season, a mysterious young girl from Hell, named Kikuri who is able to travel freely between Earth and the Twilight realm where Ai resides, is introduced. Later, comes Takuma Kurebayashi, a boy who is blamed by his townsfolk for causing disappearances around the town that are in reality caused by the townsfolk using the Hell Correspondence. In the third season, some time after Ai's death, Kikuri returns to recruit Ai's assistants along with a yÅ