In 1972, Misaki, a popular student of Yomiyama North Middle School's class 3-3, suddenly died partway through the school year. Devastated by the loss, the students and teacher behaved like Misaki was still alive, leading to a strange presence on the graduation photo. In Spring 1998, Kōichi Sakakibara transfers into Yomiyama's class 3-3, where he meets Mei Misaki, a quiet student whom their classmates and teacher seemingly ignore. The class is soon caught up in a strange phenomenon, in which students and their relatives begin to die in often gruesome ways. Realizing that these deaths are related to the "Misaki of 1972", a yearly calamity that has struck most every class 3-3 since 1972, Kōichi and Mei seek to figure out how to stop it before it kills anymore of their classmates or them.