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).

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)

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.

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

Amu's beloved Guardians Characters finally nab the spotlight in this new Shugo Chara series! Ran, Miki, and Su explore holidays, exercise, bears, cooking, painting, and more character changes than you can count in these hilarious and lighthearted short stories, told in 4-koma (4-panel) comic-strip format.
 (Source: Kodansha USA)

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