She returns to her room at night and finds a letter addressed to her on her desk. She is surprised to see the name Sonozaki Mion on the back. She sits on her bed and reads the letter which announced the reunion of the Hinamizawa Branch School's Club founders. She reads out loud, "I'm sure we've all grown used to living proper lives," as her voice is taken over by Mion's to continue, "but I hope you still have that game Club spirit where you'd do anything to win!" as the scene shifts to a view of St. Lucia's gates. Outside of them, both Rika and Satoko stand in regular clothes without speaking or looking at each other. Mion's voice crescendos into her invitation for them to return to Hinamizawa and "bathe in your fellow contenders' blood!" as a van pulls up.
The window rolls down, and the college-aged Mion asks them if they are ready for the showdown. Satoko happily replies that they have received permission to leave the campus.
As she drives them, Mion remarks that they have grown so much they will give "uncle" a heart attack. She playfully suggests that Rika must be the center of attention. Reflected in the rear-view mirror, neither Satoko nor Rika seem to share Mion's excitement. Rika calmly observes that Mion has also grown a lot. She brightens a bit as she then suggests that she must be the center of Keiichi's attention. Mion laughs and merely replies that that is the Rika she remembers. She states that she is glad Rika has not changed much. Rika emits a "Mii" and insists happily that while she may be a fine lady now, she is still herself.
Satoko rhetorically asks if Mion is in college now, the same university as Keiichi and Rena. Mion confirms this: "Gogura University." She adds that as soon as the entered they joined her game club. In her more Child Voice, Rika happily comments that she can imagine the antics that they are getting into. Mion replies that Satoko and her need to hurry up and graduate and join them. Satoko looks pensive as Mion continues that it will be easy for them to gain acceptance in their university coming from St. Lucia's. She brightens a bit when she asks Mion where they will be meeting Keiichi and Rena. She then adds that she has not asked about their plans for the day.
Mion replies that she thought she explained it in her letter: if all four of the "legendary founders" are reuniting, then she knows what they are going to do, as she hits the accelerator and her vans jumps on a familiar mountain road, and where they are going. They approach Hinamizawa. Satoko finally brightens and admits that she cannot wait to be back. Rika adds that she is also excited, then emits a "Nipaa!" This startles Satoko a bit.

Mion's van stops at their old school.
Satoko stretches as she walks with Rika. They encounter the now college-aged Keiichi and Rena who greet them. Rena remarks that it must have been a long ride. Satoko declares herself exhausted, while Rika quips that all she did was sit in a car. Satoko playfully retorts that Rika was snoring and drooling over herself in her sleep. Rika covers her ears, then embraces Rena whining that Satoko is a bully, which sends Rena into Cute Mode as she hugs her tightly. She reflexively punches Keiichi and Satoko who lie on the ground in depression created by Rena's blow. Satoko slowly raises her head and remarks that Rena is strong as ever. Keiichi asks why she hit him also. Meanwhile, Rena continues to embrace the now chibi struggling Rika. Mion calls them to get started.
Inside the school and their former classroom, Mion dramatically calls for the start of their games. When Keiichi asks her what is first, Mion walks over to the locker. She is surprised and excited that a deck of cards they used is still there. The rest quickly recognize cards based on the creases and other marks. Mion chooses a game which Keiichi agrees will work with the marked cards. Surprised, Satoko asks if they are allowed to cheat. Mion quotes Club Rule Number Two, which Rena happily repeats: " You don't talk about the Club Always strive for victory with everything you've got." Mion reaffirms that everything, including traps and cheats, are allowed, or how else would they get through a game?
Satoko startles again, closes her eyes for a moment, then transforms to her former self with her patented laugh. As noted below, her voice is her voice when she was a child. Mion reminds them that, of course, there will be penalties. Rika asks how they will work, and Mion replies that they will do them as they did in the past: everyone will write down a penalty, and the loser will pick one. Satoko laughs again and vows to choose something horrific and make sure Keiichi loses. Keiichi vows otherwise, and in her more Child Voice, Rika joins in and adds a "Nipaa!"
In a semi-montage, Keiichi holds the day. Rena loses first and must pretend she is a maid. The next game results in Satoko having to pretend that she is their "baby sister." Mion loses next, and she must change into a swimsuit. For those wondering who wrote that, Mion quickly reveals it is her as she curses that it was suppose to be Keiichi who got it! With Totally Not Fan Service, there is a pan of Mion in her school swimsuit. In said swimsuit, she encourages Rika to defeat Keiichi. Both stare at one another with Rika appearing unimpressed. She loses and chooses a penatly. She emits a sad, if not irritated, "Miii" as the scene transforms to her wearing a collar with a bell and cat ears as she repeats her cat-like "Miii." This immediately sends Rena in to Take Home Mode. Kitten Rika begs Rena to avenge her. As Rena prances about bliss, Keiichi protests that he cannot believe Rika is using Rena against him.
The two dramatically play their cards, and, of course, Keiichi loses. As he reaches in, he asks if the rest chose penalties from the past. Both Satoko and Mion admit that they did. He chooses his penalty which requires him to do all of the penalties that have been handed out. He protests that he has no idea where he will find a swimsuit. Mion genially offers her own in a fashion that When They C ry Wiki will eventually make into a gif for. . . SCIENCE! Rika offers her cat ears. Keiichi panics and runs, to the protests of Rena. Satoko reminds "Big Brother" that he will not get out of it, as she snaps her fingers, and he trips over one of her ropes. Mion compliments Satoko, and Rika asks Keiichi to be a nice boy. Keiichi, in "Maid Mode," asks forgiveness from his "mistress."
Late in the day, they have gathered outside the school. Mion declares that seeing Keiichi in that outfit was the best part of the day. Keiichi sighs over the fact that at least someone had fun; Rika pats him on the head as she laments "poor, poor Keiichi." Rena insists that Keiich was really cute, as she giggles. Keiichi smiles and responds that it is hard to believe her when she is laughing, and Rena bashfully smiles. She explains that it was fun to play games like they use to. Keiichi and Mion agree, then Rika with a "nanodesu!" For her part, Satoko stares at Rika then back towards Mion. She asks her what they will do now. She answer.png.pngs that they will go back to Okinomiya and have dinner at Angel Mort. She adds that Shion will be there as well. Keiichi eagerly asks if it will be Mion's treat. She playfully responds that she did get to see him in that outfit. She agrees to everyone's cheer except Satoko's. She continues to look sad as Mion gathers everyone into her car. She sadly remarks that that this means they will be leaving Hinamizawa again. Mion asks her what is up, and she responds that she would like to take a walk around Hinamizawa. Keiichi offers the rest to accompany her, but she transforms into her patented laugh as she responds that she would like to do so alone.
While Rika and Rena look at Satoko with some concern, Mion tells her to call Angel Mort when she is done, and she will come and pick her up. She replies that she understands, Rena tells her to be careful, and Rika walks up to her. She looks at Satoko and says that she will see her at the restaurant. Satoko replies that she will. As the rest leave in the car, Rika looks back at Satoko sadly from her window. When they pull away out of sight, Satoko sighs and allows her smile to become a sad look.
She begins her walk. She hears one man tell another that he heard that they will be demolishing the old schoolhouse. The other remarks that it has been there since the Forest Service owned it. She pauses to look at the outside of her house. She then climbs the stairs to the Furude Shrine. When she comes to the home that she shared with Rika, she finds that it has collapsed with the remains overgrown. An old woman calls out to her having recognized her. Satoko asks her what happened to the building. The woman explains that it collapsed during the previous year's snowstorm. Satoko reacts with sadness. Later, she walks to the observation point on the gounds of the shrine where she can look over Hinamizawa during as night falls. While she does this, the end titles and music start. She then walks back up the steps towards the Saiguden, whose doors are cracked open. Satoko says out loud that she knows the place. She recalls how she once climbed up on the roof and snuck inside. She smiles a bit as she wonders if Oyashiro-sama is still angry at her.
She is startled by a loud ringing sound. The air between her and the Saiguden gives out circlular pulses like ripples with the center being the doors. Investigating, she enters the Saiguden which appears empty of the various implements of torture that are normally stored there. She sees the old statue of Oyashiro-sama. As she approached it, she wonders if the sound comes from it. She touches the statue, and it starts to crack. The cracks ascend up the statue until a large piece falls to reveal a horn or fang which then falls to the ground. When it lands, the sound and ripples appear to emit from it. Satoko reaches down to try to touch it. When she touches the point from which the ripples appear to eminate, the horn emits a bright light that engulfs the shocked Satoko.
She finds herself in the plane of time fragments as the music and credits conclude.
A staff with rings jiggles. Satoko looks up to see the holder is a woman dressed as a miko, with horns, but is clearly not Hanyū.
She smiles as she tells Satoko that it has been a long time since they last met, "child of man."