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.

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.