After the events of the second 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 Tsuushin operation. Yuzuki is aware of Ai's presence, however, when she can see what Ai sees. (myanimelist.net)
1 season, 26 episodes at Criticker
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Above Ondo Maki mock at school. Every night she calls on "Hellish correspondence" and by turns enters the names of all class-mates, because does not know, who of them her invisible enemy. At school nobody decides to help her, except a kind teacher that the only cares of girl.
Caged Bird (2008)
- S1E2
Kurosaki Yaoi with family already a few months searches the sister. All this time Yaoi torment strange visions. Hearing sounds at night, she goes to the room of sister, and includes a notebook, where "Hellish correspondence" waits.
The Rotten Fruit (2008)
- S1E3
Aspiring singers at the same talent agency, Jun bullied Masako until she gave up on her dream. After Jun becomes a pop idol, Masako demands that Jun support her own debut as a singer. Jun refuses. Enraged, Masako accesses the Hell Correspondence website, receiving Hone Onna as doll.
Elder Brother (2008)
- S1E4
When the bullied Yukawa is rescued by the kendo-practitioner, Nishida Shin, Nishada becomes Yukawa’s hero. However, he fails to save a man assaulted on a bus, and Yukawa's image of his hero is shattered. He accesses the Hell Correspondence website, receiving Ren as a doll, to send Nishida to Hell.
Cicada (2008)
- S1E5
A student's grandmother begins a vendetta against Mio, her teacher, for a supposed slight against her granddaughter Ririka. When Ririka refuses to comes to Mio's defense, Mio access the Hell Hotline.
My Teacher (2008)
- S1E6
Yuna in love in the teacher of physical education and jealous her of other teacher. She calls to the Hellish girl.
Liar (2008)
- S1E7
A mother compels a son to tell that she in earnest is sick. Atsushy calls to the Hellish girl.
Lost Inari (2008)
- S1E9
A girl in a class is famous that her fortunetelling's come true. But to kill a man for her does not turn out. She has to appeal to the Hellish girl.
A boy named Ichimura Kazuya is a marathon runner. He does the morning rounds of newspaper in order to support his mother’s habit of buying kimonos from a charming salesperson. His parents are constantly fighting, so his mother uses money (she believes they are from the husband) to buy kimonos. Kazuya’s hatred for the salesperson drives him to the Hell Hotline.
The Blotted Page (2008)
- S1E11
Kuzuya's mother spends all money on new kimonos. Kuzuya intends to send a salesman in hell.
Mid-Summer Graph (2008)
- S1E12
Namura defined yet, who to send in hell. But he found a method to be quicker determined.
The Six-Script Lantern (2008)
- S1E13
Kitagava wishes to avenge the father. The best friend Yuzuki sets forth for hell.
Rabbit and Tortoise (2009)
- S1E15
All consider Usagi a tortoise. A brother gathers to send her in hell, but also she not so is innocent, as seems.
Inside the Straw (2009)
- S1E17
Yuzuki visits a mansion to visit the elderly woman she saw in her vision. However, a much younger woman comes to the door and claims that there is no one in the house who fits the description. Meanwhile, Yamawaro begs to be a doll.
Special Radio (2009)
- S1E18
A girl constantly writes on the favorite broadcasting. Her letters are popular. But she knows once, that all in a transmission goes on a scenario.
Snow, Moon, Flowers (2009)
- S1E19
Hereditary family of florists lives in city. Once the rights an extraneous woman declares on the head of family.
Hell Doctor vs. Hell Girl (2009)
- S1E20
Yamawaro and Kikuri approach a large mansion belonging to a client but are unable to enter due to an encircling barrier. At night, the owner of that mansion accesses the Hell Correspondence website and types Tsugumi's name. Each sensing the request, Yuzuki, Ai, and Tsugumi make their ways towards the mansion. Once they gather, he explains that he yearned to meet Ai.
The Back Front (2009)
- S1E21
A stepmother beats unmercifully a stepchild. A boy gathers to take advantage of hellish mail.
Flower and Moon (2009)
- S1E22
Sumika is the twin sister of the famous actress and model, Yuika. Despite Yuika's upbeat facade, she is a cruel and spiteful person who forces her twin sister to do all her own work while acquiring all that Sumika desires: fame and love. When the two switch roles, one of the sisters will access the Hell Hotline.
Twilight Hill (2009)
- S1E23
Fumio Mizuhara is constantly bullied by Tomohide Matsuda whose little sister is inquiring about the whereabouts of their father. Fumio later discovers the Hell brand on Tomohide's chest and deduces that he has sent his abusive father to Hell.
Mayfly (2009)
- S1E24
Yuzuki realizes that nobody at school or in her neighborhood knows who she is. Tsugumi has given up hope of stopping the Jigoku and concludes that Yuzuki is not a person of this world anymore. Tsugumi notices that all this time,Yuzuki's life was an illusion.When Yuzuki returns home, she finds her apartment in derelict state and makes a horrifying discovery in the ruins.
Yuzuki (2009)
- S1E25
Yuzuki lived happily with her parents, until her father, a bus driver, died in a bus crash due to faulty brakes. The whole town accused the Mikage family of murder and being irresponsible. Sick and without means to support herself she decides to leave.
Spiritual Locus (2009)
- S1E26
Takasugi wants to send Azusa to hell because she took away Akie's life. Yuzuki was eager in awaiting Takasugi to pull the string, but Takasugi backed out, saying Azusa would go to hell after she dies anyway. Angry at this, Yuzuki decides to send Azusa to hell anyway.