Three years have passed since the "calamity" of 1998, which killed many students in Class 3 of Yomiyama North Middle School. When Sou Hiratsuka, an acquaintance of 1998 survivor Mei Misaki, finds out he has been assigned to the cursed class, he and his classmates devise countermeasures to prevent a new tragedy. However, as Sou's peers and their relatives start dying in a series of gruesome "accidents," Sou and Mei realize the calamity has struck their town again. To stop the wave of deaths, the two must confront Yomiyama's deepest mysteries...