Kouichi's aunt from Ritsuko's side  ~!and class 3-3 deputy homeroom teacher. She gives her nephew advice on how to make it through Yomiyama through a series of "rules". One of them is to separate the private life from school life, thus Kouichi addresses her as Reiko at home, and Ms. Mikami at school.!~  ~! She is also revealed to be the extra/dead one. Reiko was murdered about an year and a half before the accidents started to happen.!~

When Kouichi Sakakibara transfers to a new school, he senses a frightening atmosphere in his new class, a secret none of them will talk about. At the center is the beautiful Mei Misaki. Kouichi is immediately drawn to her mysterious aura, but he begins to realize that no one else in the class is aware of her presence. Soon after his arrival, what is known as the Calamity begins, and it claims the lives of many students. 
 
(Source: Sentai Filmworks)

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In the spring of 1998, Koichi Sakakibara transfers into Class 3-3 at Yomiyama North Middle School. But little does he know...his new class has a horrible secret. When he takes his seat in class for the first day of school, Koichi is unsettled by his fearful classmates. Despite this atmosphere and warnings from fellow students, Koichi is drawn to the beautiful, distant Mei Misaki, another classmate. But the closer he tries to get to her, the more mysterious she and their class become. And when a fellow student dies a disturbing death - the first of a long chain of deaths - Koichi seeks to learn the truth behind the curse of Class 3-3. But can he get answers before the curse kills him?
 
(Source: Yen Press)

In a third-year classroom of Yamakita Middle School 26 years ago, there was a student named Misaki. As an honors student who was also good at sports, the charming girl was popular with her classmates. When she suddenly died, her classmates decided to carry on as if she was still alive until graduation. Then, in the spring of 1998, a boy named Sakakibara Kouichi transfers to that classroom, and he grows suspicious of the fearful atmosphere in it. In particular, there is a beautiful, aloof girl named Mei Misaki who wears an eyepatch and is always alone drawing pictures.
 
Note: Originally serialized in literary magazine Yasei Jidai between 2006 to 2009. Illustrated version printed under the light novel Sneaker Bunko label in 2012.

A two-chapter prologue of Another about Reiko during her high school days. 
Note: The manga was first released as a bundle with a prequel OVA to the anime then later republished in hardcover format with a side story novel to the main series, subtitled “Episode S”.

Reiko Mikami