Near the waterfall in the sunset world, Ai sings a song as she stacks rocks by the river. Meanwhile, Tsugumi is approached by one of her classmates who is angry at another student for breaking a keychain. Tsugumi is horrified when that classmate says she wants to contact the Hell Girl, recalling how the last person who got sent to Hell was completely innocent. After class Tsugumi runs home, but is hospitalized after being hit by a truck. Hajime tells Tsugumi how worried he was about her. Tsugumi asks Hajime if he would have wanted the driver dead if she'd died despite the driver showing genuine remorse. Hajime tells Tsugumi that he's done chasing Hell Girl, but when they get home Tsugumi wonders if it's right for it to just end. Hajime gets an assignment to Hawaii to write an article. He starts making the arrangements for the trip, but Tsugumi has another vision and begins asking "Do you know Sentaro?" Hajime begs the Hell Girl to stop haunting them, but Tsugumi awakens and says it isn't over and wonders if Ai needs their help. In the sunset world, Ai's grandmother notices that something is troubling Ai, who brushes the comment off by saying she's just tired. Based on Tsugumi's directions and the photography collection she bought before, she and Hajime head for a small town called Natsumi Village. As Hajime wonders why Ai thinks that Tsugumi knows Sentaro, Ai watches from the mirror. Hajime stops driving until he and Tsugumi are sure that Ai is gone.
Hajime and Tsugumi stop at an inn for the night and the innkeeper notes that it's unusual to have guests during the winter. As it starts snowing, Tsugumi heads over to the inn's hot spring to take a bath, but Ai appears and asks her if area is familiar. Ai disappears as Hajime comes into the room and Tsugumi tells him that Ai was just there. Hajime wonders why Ai would ask that since they've never been there. The next morning, Hajime asks for directions to the location where a photo of the tree near the waterfall from Tsugumi's more recent visions was taken. The innkeeper directs them to a Buddhist temple nearby, where Ai is waiting for them. Inside the temple, Hajime introduces himself and the priest notes an odd coincidence. The priest gives them some black candies that are given to the temple several times a year as a gift and then asks if Hajime and Tsugumi have heard of a ritual called Seven-Sending, which startles Ai. Seven-Sending was a harvest ritual performed by the local villagers centuries ago that involved sacrificing seven-year-old children to appease the spirit of the mountain in return for a bountiful harvest. Ai has a flashback to the ritual being performed when she was alive with her as the intended sacrifice. Sentaro was one of the onlookers. Supposedly, the temple was built to calm the souls of the sacrifices and was named Seven Child Temple because of this. The black candy is produced by a shop which was founded by the temple's founder. The temple was built more than four centuries ago during the Warring States Period and the temple's founder lived in the village at the time before fleeing and founding the shop. Hajime asks what the shop was called and the priest says that the odd coincidence regarding Hajime's name was that the shop is called "Shibataya". Outside, Ai now understands her connection to Tsugumi. Before leaving, Hajime asks what the name of the original shop owner's name was and the priest tells him it was Sentaro.
In the Sunset World, Ai's minions wonder where Ai has been going lately. Wanyuudo says that it can't be on business when the spider shows up, which leads Wanyuudo to the conclusion that Ai is looking into her own grievance. At the waterfall in the world of the living, Ai gives Hajime and Tsugumi a vision of time when she was alive, showing that she and Sentaro were good friends. Ai herself appears in her kimono as the illusion fades, realizing that the descendants of the one who betrayed her are still alive. She gives Tsugumi another vision, this time of Ai being buried alive and crying out for Sentaro. Tsugumi realizes that Sentaro helped sacrifice Ai and Ai wonders if they've come to kill her again and erase what Sentaro did. Seeming to think that Sentaro has returned to kill her again, Ai tries to banish them to Hell. Ai's minions show up to try and stop her since if Ai tries to take revenge for her death, she will damned for eternity. Ai sends out a blast of darkness to kill the Shibatas, but Wanyuudo blocks it in his carriage form. Ichimoku Ren tells them to run. Hajime and Tsugumi try to run away, but Ai blasts them into the pond at the bottom of the waterfall. Lightning strikes the tree behind Ai, setting it on fire as she says that it's time to consign her own grievance to Hell.
This episode contains examples of:
- Being Personal Isn't Professional: What tips her minions to Ai's lack of appearance isn't business-related is the presence of the Spider.
- Buried Alive: How Ai died,as she shows them in flashback.
- Casting a Shadow: Ai is shown to be able to do this and she sends one after the Shibatas.
- Human Sacrifice: Ai was one, so the village could get out of a famine, though she was picked specifically because they wanted to get rid of her.
- Not So Stoic: Ai looses her stoic nature and turns into a vengeful beast upon confronting Hajime and Tsugumi.
- Oh, Crap!: Wanyuudo's realization that Ai has been looking into her own grudge provokes one.
- Sins of Our Fathers: Ai's reason for trying to kill Hajime and Tsugumi boils down to this, though it's also possible that she mistook them for Sentaro himself.
