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

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. 

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).

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