Another

Ikuo Takabayashi dies next, and Kōichi's classmates start ignoring him. Mei explains that she does exist. After the 1972 Class 3-3 incident, there was always an extra student in the class. The "extra" was dead but did not know it. No one could identify who it was, and the deaths began, year after year, with no one remembering the "extra" after graduation; they would disappear. To prevent this, the class treats one student like they do not exist to make up for the student who is actually dead. This year, it is Mei, and now Kōichi.