It’s been almost a year since Natsumi and her family moved from the town of Onigafuchi. Her grandmother, a native of Hinamizawa village, fears that they will be cursed for abandoning the mountains, but Natsumi has never been happier, making new friends and enjoying school life. When a terrible gas explosion in Hinamizawa wipes out everyone in the village, her grandmother is convinced it is the wrath of the village god, Oyashiro-sama. Natsumi’s family has never taken Grandmother’s beliefs seriously, but her devotion to Oyashiro-sama has taken a frightening turn. Have the old woman’s fanatical convictions gone too far?

At St. Lucia Academy, the body of a male teacher has been discovered in the pool. The girl who found him, Mizuho Kousaka, is a shy bullied student who seems relatively unaffected by her discovery. After all, this isn’t the first time she has seen a corpse. In order to teach Mizuho to stand up for herself, a girl named Shion Sonozaki befriends her and the two become inseparable, as they both share traumatic pasts. But when another body is found, Mizuho comes under suspicion for murder.