An enigmatic little girl introduced in season two, episode 4 and then starts to reappear in season two. Little is known about her except the fact she is not an ordinary human as she can wander freely between the mortal plane and Ai's house in the sunset world, sometimes interfering with her and her companions' job. Her appearance is often accompanied by a lullaby-like background music. In stark contrast to Ai, Kikuri has completely blue/purple eyes (including most of the sclera) and her personality is far more childish (yet much livelier as she has the tendency to pull pranks) than Ai's. She has stated that she likes Ai, but her actions and use of powers seem to serve causing the greatest amount of suffering and fear possible. It is as yet unknown whether this is due to true malice or not. Occasionally, she seems to take delight in acts of low-level destruction, such as chopping off flowers or destroying anything that Ai cares for. She has shown incredible skills with her loincloth, using to catch or hit objects. Despite the fact she appears to wreak havoc on her, she takes orders from Ai and Ai alone (in one episode, she shows this while going to touch Ai's grandmother's spinning wheels despite the woman's protests).    ~!In the last episode of the second season, it is revealed that Kikuri is in fact a host for the will of the Spider, which can take over her body as it pleases. As such, it becomes questionable how many of her malicious acts were of her own will and which were instigated by her master. After Ai's death and the release of her beloved ones, Kikuri, riding on the boat, says, "It's over...that was Ai's answer...Well done." As she says those words, she pokes a cherry the color of Ai's eyes in her former childish way.!~

Ai Enma once again returns as the Jigoku Shoujo, who uses Jigoku Tsuushin (Hell Hotline) to allow people to post their grudges on their tormentors, sending them straight to Hell. In exchange, the users of the website will end up in Hell after they die. Meanwhile, a mysterious girl with blue eyes called Kikuri appears and seems to have strange intentions towards Ai and Jigoku Tsuushin's operation. 
(Source: Anime News Network)

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After the events of the 2nd season, Ai's three helpers, Ichimoku Ren, Wanyuudou and Hone-Onna live out their lives in relative peace. This is suddenly shattered when Kikuri returns to recruit them. Meanwhile, Ai mysteriously reappears from the dead and uses the body of a young schoolgirl, Yuzuki Mikage, to continue the Jigoku Ts&#363;shin operation. Yuzuki is aware of Ai's presence however, when she can see what Ai sees. 

Hell Girl Enma Ai and her group return for another series to continue their task of transporting cursed people to hell. New questions arise when a previously unseen girl dressed in green appears before them. As her appearances grow more frequent the mystery behind her purpose is gradually revealed even as the task of carrying people to Hell continues.
 
(Source: Anime News Network) 
 
Episodes 7-12 are rebroadcast episodes from previous seasons with minor edits. Episode count does vary for home video and streaming releases. 
7: S1 Ep3 
8: S1 Ep6 
9: S1 Ep12 
10: S2 Ep12 
11: S3 Ep2 
12: S3 Ep9

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).