

In the Another anime, they show how the students discovered how to end the
calamity. But as far as I remember, (or may be I missed it) they don't mention
how they came to the conclusion that the calamity comes from the existence of
an extra person in the classroom.

How did the students discover that the calamity comes from the existence of an
extra person? Is this mention in the manga, in a prequel or something?


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another
How did the students discover that the calamity comes from the existence of an extra person?


This was obvious that the calamity came from an extra person. They had sensed
a pattern based on history of the class. Various countermeasures came up but
they were unsure of a permanent solution.

Let's look at the timeline:

**1972** : A student named Misaki Yomiyama died in a house fire. The students
didn't believed he was dead and put his desk in the class. Over time, their
memory garbled and completely forgot about him next year.

**1973** : The class founds that there is an extra person and one desk short
(the soul of Misaki converted into a physical being that gave a illusion of
extra person). The students ignore but calamity struck in order to give space
for the extra. People got killed

**1983** : Katsumi Matsunaga and his friends went to shrine. He got an
argument with the extra and accidently killed him. Next day, he didn't found
the body. Calamity ended prematurely. He come to conclusion that if you kill
the extra, then the calamity will stop. He taped the conclusion in a video
recording. It is to be retrieved in 1998.

**1988** : Over the years, the students tried many ways to prevent the
calamity, nothing proved to be successful. Eventually, they came up with a
plan to ignore one student as if he/she doesn't exist, in order to make up for
the presence of the dead person. For a whole year, the class would not
acknowledge their presence or speak about them during school hours. This
measure is followed in coming years.

**1998** : Kouichi Sakakibara got transferred to class 3-3. Believing that he
might be the extra, students ignored him. Calamity struck before he
transferred, thus proving he was not extra. Finds the tape. Kouchi finds out
the extra amidst chaos. Kills her. Calamity stops.


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answer