The story of different individuals that have a certain grudge access the Hell Hotline (Jigoku Tsushin) to enter the name of those they want revenge on. Enma Ai, the hell girl, takes on the revenge for them in exchange for eternity in hell after their death. 
 
(Source: Anime News Network) 
 
Included chapters: 
Volume 3 contains the side stories "Karinui" (かりぬい) and "Sakura Uta" (さくらうた). 
Volume 4 contains a prologue. 
Volume 6 contains the side story "Ichimokuren" (一目連). 
Volume 7 contains the side story "Kamifuusen Fuwari" (紙風船ふわり). 
Volume 9 contains the side story "Yukemuri Jigoku, Tabi no Yado" (湯けむり地獄、旅の宿).

Somewhere in the vast sea of the Internet, there's a website that can only be accessed at the stroke of midnight. Known as the Jigoku Tsushin, rumor has it that if you post a grudge there, the Jigoku Shoujo will appear and drag whoever torments you into the inferno. Very little is known about the girl - all we know for sure is that she lives with her equally enigmatic grandmother, that three magical straw dolls accompany and serve her, and that whenever a posting on the Jigoku Tsushin moves her, she becomes the Jigoku Shoujo.

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