Ep. 13: Keiichi investigates the Hojo residence and discovers Rika's body before Satoko attacks him.
Aired on June 28, 2006

13
Keiichi visits the Hojo residence to check on Teppei and finds Satoko needing medical attention. He transports her to the clinic, only to learn that Coach Irie has died by suicide and Oishi is missing. Satoko asks to retrieve clothes from Rika's house. At the Furude Shrine, Keiichi finds Rika's mutilated corpse. Satoko accuses Keiichi of being possessed by Oyashiro and pushes him off a bridge. Desperate, Keiichi wishes for the village to perish. Poisonous volcanic gas from the Onigafushi swamp erupts, killing everyone in Hinamizawa. Keiichi survives the fall and the gas leak, becoming the sole survivor of the disaster.
Episodes
- Ep. 9 · Keiichi investigates Satoshi's disappearance after his parents leave for Tokyo
- Ep. 10 · Keiichi Intervenes When Satoko Is Absent Due to Abusive Uncle Teppei
- Ep. 11 · Keiichi resolves to kill Teppei and buries the body after a fatal confrontation.
- Ep. 12 · Keiichi learns he attended Watanagashi and confronts Satoko's uncle's abuse and a buried body.
- Ep. 13 · Keiichi investigates the Hojo residence and discovers Rika's body before Satoko attacks him.
- Ep. 14 · Mamoru Akasaka investigates a kidnapping in Hinamizawa four years after the dam incident.
- Ep. 15 · Akasaka learns of the Watanagashi curse and the fate of Rika from the past.
- Ep. 16 · Shion recounts her past in Hinamizawa, revealing her secret identity and complex relationships.
- Ep. 17 · Satoshi apologizes to Shion and asks her to care for Satoko during the Watanagashi festival.