In the spring of 1998, in the town of Yomiyama, Kouichi Sakakibara is scheduled to begin classes at a new school. Unfortunately, he is confined to the hospital because of a collapsed lung. While wandering through the hospital, he encounters a dark-haired girl named Mei Misaki wearing his new school's uniform—an innocent chance meeting that will have more repercussions than he realizes. When Sakakibara is finally able to attend classes at Yomiyama North Middle School, he notices that his classmates treat Misaki as if she does not exist. He tries to uncover the mystery surrounding her, but his classmates' behavior only becomes stranger. And when fellow students in Class 3-3 inexplicably begin dying horrible deaths, Sakakibara begins to question a link between Misaki and the rising body count.