Rena becomes increasingly frustrated with her father's affections for Rina, a showgirl at a gentleman's club frequented by her father. Satoko begins her plan to trap Rika in Hinamizawa by injecting Rena with H-173 as she sleeps in the nurse's office. Rena discovers that her father has been spending large sums of money on Rina taken from the settlement from his divorce from Rena's mother. Rena reflects on her parents' divorce and concludes that she did not try hard enough to stop the divorce and that some people are not deserving of kindness.

Rena purchases tools at a local hardware store and places them in her hideout at the Dam Construction Site. Rina visits Rena's house and is delighted when Rena suggests that the two spend time together.

After witnessing Keiichi speaking with Oishi outside of school, Rena becomes convinced that Keiichi knows about her crime.

After watching Rika express her continued resolve to escape her fate to Hanyu in the Sea of Fragments, Satoko awakens alongside Rika in a new world. In need of a more reliable murder weapon, Satoko manipulates Teppei into giving her the contact information for an arms dealer.

Mion begins to develop feelings for Keiichi. Posing as Shion, she delivers a dinner box to him to thank him for giving her the doll. While working at a games shop one evening, Mion runs into Keiichi and Shion who appear to be on a date. After Keiichi and Shion leave together, Mion becomes tearful and angry. On the night of Watanagashi, Shion and Keiichi sneak into the ritual storehouse while Mion wonders about their whereabouts. Mion begins to scratch her neck after Satoko suggests that the two must be off alone together.

Mion lures Kimiyoshi to the Sonozaki mansion and violently tortures him to obtain information about Oyashiro's curse. The next day, Mion overhears Rika telling Keiichi that the world is "finished," leading Mion to believe that Rika is behind Oyashiro's curse. Not knowing of Rika's whereabouts, Satoko becomes concerned since she is unable to travel to a new fragment with Rika unless her death can be confirmed.

In a new loop, Rika tearfully confides in Satoko about her "nightmares." Satoko suggests that the nightmares may be messages from Oyashiro and encourages her to stay in the village. Later, the games club members participate in a baseball game which ends in victory when Satoko hits a home run. After a celebratory barbecue, Satoko visits Teppei in Okinomiya. She asks him to move in with her, explaining that the entire village has been bullying her.

Satoko continues deceiving her friends and her uncle by posing as a victim of abuse.

Satoko stops attending school and continues convincing Teppei that she is being bullied by the village. Keiichi and the others begin protesting outside of Child Welfare Services. Wanting to protect Satoko, Teppei invites Oishi to the house to explain the situation.

Keiichi continues to lead protests outside of Child Welfare Services to save Satoko. After seeing Keiichi's determination, Oishi suspects that he has been tricked by his friends into unwittingly taking part in bullying Satoko. When the Sonozaki family begins pressuring Child Welfare Services into action, Oishi offers to escort a social worker to the Hojo residence.

After beating her uncle to death, Satoko showers to clean the blood off of herself and attends the festival with Rika and the others. During Rika's dance, Satoko lures Keiichi away and asks him to come to her house.

Hanyu reminisces about her past and her relationship with Rika in the Sea of Fragments. Satoko overhears Hanyu telling Rika about a sword hidden inside in the ritual storehouse that can kill someone living in loops.

Eua overpowers Hanyu and forces her to watch Rika's death at the hands of Keiichi and Satoko in two separate fragments. While purchasing a present for Satoko's birthday in a new world, Rika begins to experience memories of being killed by Oishi.

Rika and Satoko begin to fight to the death across numerous loops.

Rika begins punching Satoko, telling her that she could never live in a world without her.

After Satoko's panic attack, Keichi, the club, and the rest of the class are desperate to ensure her safety.

Keiichi goes with Rena to retrieve the Colonel so she can take him home with her. Later, Keiichi and his friends have fun at the festival and watch Rika performing the ritual.

Keiichi makes a bet to the club that he can cook better than Satoko. The same night, he attempts to fry some vegetables but nearly burns down his own house. Rika and Satoko arrive to put out the fire and Satoko prepares her own dish. Rika explains to Keiichi that Satoko is taking a liking to cooking for him since it reminds her of when her older brother, Satoshi, used to wait for her meals.

A year after escaping near death, Rika reminisces about Hinamizawa; Satoko receives some surprising news; Rika decides she wants to go to St. Lucia Academy.

Keiichi spends his day accompanying his friends. He, Mion and Rena are on a tour to the village. Afterwards, he retrieves the statue of a fast food restaurant mascot because Rena finds it 'cute'.

Keiichi and his friends attend a game competition at a Sonozaki family owned shop. As a consolation prize for the event money, the store owner gives dolls to everyone except Mion. Keiichi gives his to Mion as he sees no value in keeping it. Later, Keiichi and his father meet at the cosplay restaurant. There, Keiichi meets Shion and confuses her for Mion, due to similar appearances. She proclaims that she is actually Mion's twin sister. Keiichi believes she is Mion pretending to be effeminate.

Following Keiichi's lead, everyone head to the child guidance centre to try and save Satoko.

Rika tells Satoko about a dream she's been keeping secret for a long time; Satoko is confused.

Keiichi learns more about Satoko's painful past, which causes him to care for her even more.

Rika makes a decision; Rika and the club members visit a toy store in Okinomiya.