Higurashi When They Cry: Demon Exposing Arc (Manga)

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?