Hell Doctor vs. Hell Girl
An old man named Mizuragi Shōgo types Tsugumi's name into the Hell Correspondence. Each sensing the request, Yuzuki, Ai, and Tsugumi go to his mansion. Shogo explains that he gained interest in Hell after his mother used Ai's services to send his father to Hell. After years of research, he yearned to meet Ai and so had an artificial grudge against Tsugumi planted in his mind through hypnosis in order to feel enough hatred to meet her. The others all protest, as Tsugumi has done no wrong, but luckily, just before Shogo can pull the string to send her to Hell, he is instead sent to Hell by his assistant due to how Shogo took in many orphaned children only to treat them cruelly and try to send them to Hell for his research.
More from Hell Girl: Three Vessels
Episode 1
The Girl Who Was Taken
Since Ai's death, her companions have gone their separate ways. But Kikuri announces her return, and they gather as faculty and staff at a school.
Episode 2
Caged Bird
Yuzuki is troubled by the experience involving Ai, Tange, and Itsuko's recent transfer to a new school. Akira Kitayama, a middle schooler, goes to see a shopkeeper, Mitsuko, with whom he is in love. Akira later sees her husband Seiji beating Mitsuko and wrongly accusing her of seducing Akira. Yuzuki sees visions of Akira accessing the Hell Correspondence website. Akira tries to persuade Mitsuko to leave her husband, but when an angry Seiji attacks both of them, Akira sends him to Hell to save Mitsuko. The next morning however, Akira finds Mitsuko's shop abandoned, as Mitsuko has left, leaving Akira to ponder the consequence of his decision.
Episode 3
The Rotten Fruit
Yuzuki and her best friend Akie rescue an idol, Jun Moriyama, from a stalker, and meet a woman, Masako Momota, who asks them to pass an envelope to Jun, containing photos of Jun in provocative outfits of the time before she debuted. Masako had attended the same talent agency as Jun but Jun bullied Masako until she could take no more and left, sacrificing her dream of becoming a singer. Ai's companions wonder if Ai is possessing Yuzuki because she doesn't have a body of her own in the real world. In the present, Masako makes Jun apologize, and demands that Jun vouch for her to debut. Jun refuses, stating that Masako cannot sing. At her concert, Jun attempts to make a public apology to Masako for her bullying, but an enraged Masako sends Jun to Hell.
Episode 4
Elder Brother
Yukawa is constantly bullied by his classmates until one day, he is saved by a stranger named Nishida Shin who knows Kendo. Nishida begins teaching him Kendo, causing him to become more active, outgoing, happy, and cool. He is also no longer bullied. However, one day aboard a bus, a deranged man begins threatening another man for staring at him, cutting the other man's hair off and dragging him off the bus. Yukawa's image of his hero is shattered when Nishida fails to intervene, supposedly afraid of putting Yukawa in harm's way. He sends Nishida to Hell. Feeling the world cannot change even if he himself changes, Yukawa quits Kendo and reverts to his former timid self.
Episode 5
This Mundane World
Yuzuki accidentally bumps into first-year student, Katase Ririka, causing her to break a beaker. The two of them report the damage to teacher Mio Niiyama, who lets the two off without punishment. The next day, Ririka's grandmother shows up at school and accuses Mio of picking on Ririka and continues to verbally attack her over the phone that night. The situation intensifies as Ririka's grandmother hands out leaflets that defame Mio and says she will keep Ririka home until Mio resigns. Mio tries to get Ririka to clear her name, but Ririka deliberately slanders Mio to her grandmother, meaning Ririka was the cause of her grandmother's drastic actions. Saddened, Mio sends Ririka to Hell.
Episode 6
My Teacher
Yuuna Serizawa, a third-year student, holds a grudge against Ren, and tries sending him to Hell, but her request is obviously rejected by Ai. Serizawa is infatuated with Hone Onna and sees Ren as a rival. Hone Onna corrects her misunderstanding, offering a band-aid for her injured knee. Yuuna flaunts the same band-aid on her neck, showing off to her classmate, Kira Moroboshi, who bears a similar obsessive affection for Hone Onna. At school, when Moroboshi finds her shoes thrown into a dirty bucket, Serizawa blatantly lies that she did it under Hone Onna's instructions. Enraged, Moroboshi sends Serizawa to Hell. Later, she ironically announces that she is no longer after Hone Onna, but Wanyūdō.
