With a view of the outside and the sound of higurashi, the scene returns to the room. Keiichi asks her why someone has to die on the night of Watanagashi. Mion insists that, at first, the deaths were coincidences, but then, eventually, it changed. A few zealous people started to use the curse as an excuse. When Keiichi asks her what that means, she explains that one could kill someone if they did it for Oyashiro-sama on the night of Watanagashi with the excuse of protecting the village. He insists he cannot believe this happens in this day. Mion carefully stands and commands him to follow her.
Outside and in front of two heavy metal doors, Mion continues her explanation. She reminds him of the torture tools he saw in the Saiguden. Keiichi rationalizes that the tools are old while admitting that Takano was enfatuated with them. She opens the doors, and the stench disturbs Keiichi. Mion continues to explain that the tools were used to uphold the strict religious laws of Onigafuchi by torturing and killing those who broke them as a warning to others. She explains this as she leads him down a corridor. Keiichi tries to insist that such happened only in the past; Mion agrees, but she then explains that in the past the Three Great Families oversaw the Watanagashi ritual. However, when the Furude and Kimiyoshi families lost their influence, and it became harder and harder to maintain such control, the tools were put away. 
She leads him down stairs to another set of doors as she reveals that for that reason, her family built this place where the ritual could still be carried out in secret. She opens the doors and invites him to see the "tools" her family has. She reveals a room that has a separate seating area to their left, with various implements to their right. She sarcastically deems it modern times in "1983," using the traditional dating, then reminds that Hinamizawa remains Onigafuchi, "the village where demons lived." Nevertheless, she does admit that as far as she knows no one has ever actually used the torture implements; however, the rumor remains that the tools exist and are ready for use if necessary.
The scene shifts to an area with cells. Keiichi asks her what the place is, but Mion merely walks to two heavy doors. She places her hands on them and calls it her uncle's (おじさん・ojisan) safe room, the most secure place on their property. She opens it to reveal a cell that does have bedding and a sink. Keiichi suggests that it looks like one could live in the safe room, to which Mion confirms it appears that way because one can. It has plenty of food, a phone, and electricity. A further view shows a station with multiple closed-circuit televisions. Mion claims that one could live there for a month if necessary. She then adds that because of that, he does not need to worry.
When he asks her what she means, she answer.png.pngs that she wants him to stay in the room for a little while, as she opens a cell door, then adds, "starting right now." Ever in possession of a clue, he protests about what he would tell his parents as he walks in front of the entrance of the cell. Mion pushes him in and closes and locks the door. In response to his protests, she insists that as long as there are people who wish to carry out the curse, and Keiichi relents to admit he understands. He asks her why, and she insists that she will do something about it, and he needs to stay there until she does. Should worse come to worse, she continues, then he can tell people that she locked him up and he is just a victim.
After a pause, Mion raises her head and looks at him. He asks her what she is planning on doing. She does not answer.png.png for a moment. She then explains that if anyone is in trouble in Hinamizawa, someone who has the power to help will do what he can. Keiichi remembers when the Motorcycle Gang was cowed by the villagers. Things changed after the Dam War, when it became about obtaining revenge on behalf of the village. She starts to explain that that was why Satoko's family, but she trails off and turns away from him. She blames her family for allowing the change to happen. When Keiichi argues that that happened long ago, Mion agrees that they are no longer in the time of "demons"; they are in the present of 1983. She then turns to face him and announces that as the de facto head of the Three Great Families and heiress to the Sonozaki, it is her responsibility to put a final end to this custom. Keiichi begs her to let him help her. 
Mion looks down and smiles. She asks if he remembers giving the doll to her. Keiichi has a flashback to the incident with Mion smiling as she clutches it to her chest. She blushes as she notes that he treated her like a girl and it made her happy. She then confesses that she loves him (私は圭ちゃんが大好き・Watashi wa Kei-chan ga daisuki). For this reason, she must protect him and and the only way to do that is to end the tradition. Keiichi can only respond by saying her name, which causes her to smile, but they are interrupted by an alarm.
Mion moves to the close-circuit televisions. Keiichi asks if that means someone is there, and Mion darkly and sarcastically replies that their "minions" have arrived. Perhaps they have figured it out, she muses. She continues that she will greet them. Over his protest, she calmly apologizes that she has to greet their "guest." She opens a drawer and pulls out a revolver. This freaks Keiichi out, who tries to insist that it cannot be real, but Mion merely walks away. She stops without turning back to suggest that she may be gone for a while. Panicking, Keiichi insists that she call the police. She smiles and tells him that she is sorry that she cannot trust them. She adds that if she does not return and someone else finds him, he should just tell them that she trapped him there. Keiichi desperately calls after her, but she walk through then closes the heavy doors.
Keiichi tries to break through his cell's doors by running and slamming his shoulder against them. The third try actually is a charm, and he breaks through. He looks at the video screens which show numerous men in grey uniforms. He has less success with the heavy doors. Exhausted and bloody from his attempts, he can only call out Mion's name and collapse. After a fade to black, Ōishi's voice calls out to him. He appears to be being carried on a stretcher with Ōishi looking down at him. A view of the outside of the Sonozaki compound reveals numerous police vehicles.
The date reads, literally, "a day in June (６月某日・6 tsuki bōjitsu)." Keiichi, with his head bandaged, stares at the doll in the store window. He says Mion's name. Ōishi calls out to him. He explains that he tried to visit him at the hospital, but he was discharged that day. The scene shifts to them sitting on a park bench. Ōishi asks him how he is feeling. Ōishi explains if a detective had not heard the gunshot, they may never have discovered what happened, and he is glad they at least saved him. He laughs at this, but Keiichi interrupts him to ask if that means Mion, and Ōishi in turn interrupts him to tell him to stay calm. Over Keiichi's protests, he sternly asks him if he know about the well in the underground prison. Keiichi turns sheepish as he explains that he does not since that was the first time he had ever been there. Ōishi continues that they investigated and found the bodies of Sonozaki Oryō, Kimiyoshi Kiichiro, and Shion. Over Keiichi's protests, Ōishi reveals that they also found skeletal remains that are over ten years old that belong to at least three victims. He then describes how they found Rika in the septic tank of the outhouse at the school. Keiichi recalls in a flashback being unable to open the door only to have Mion call out to him.
He realizes that Mion was involved and haltingly asks about her. Ōishi replies that she was found dead alongside the body of Satoko in the hallway of the Sonozaki mansion. The end credits begin as Ōishi rises from the bench and continues speaking. So many bodies will require investigation, and he informs Keiichi that he may need to ask him more questions sometime, and he hopes he will cooperate. As Keiichi sits stunned, Ōishi promises that if he learns anything he will tell him.
After he leaves, Keiichi imagines the well. He recalls that Mion assured him that the underground room was the safest place in Hinamizawa; yet, that is where they found Shion's body. The scene moves to the bottom of the well where her body lies under the water. He then recalls that where he looked for Rika with Mion was where they eventually found her body as the scene shifts to her face under water. Keiichi haltingly realizes that this all suggests that Mion was responsible for all of the deaths. He looks up at the sky and wonders if Mion really was trying to protect him from some conspiracy "or," but a fade to black cuts off his final words
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