| Clue | Character name |
|---|
| Aunt to the male protagonist and 3rd year 3rd Class deputy homeroom teacher | |
| Twin sister of the female protagonist. Formerly adressed as her cousin and her 'other half'. | |
| Classmate. He's one of the class delegates and an honor student. | |
| Classmate and a member of the Art Club. | |
| 3rd year 3rd Class homeroom teacher. Kills himself in front of the class after realizing that he couldn't avoid the calamity this year.. | |
| Classmate and in charge of countermeasures. | |
| Female protagonist. She has been treated as non-existent until the summer break. | |
| Receptionist of the doll story and grand aunt to the female protagonist. | |
| Classmate and a friend of the protagonist, whom he nicknamed 'Sakaki'. | |
| Librarian of the 2nd library at school. He was the homeroom teacher of 'the first year' (1972) | |
| He was an honors student from 3rd year 3rd Class in 1972. His sudden death, and the following pretending of his existence by classmates and teachers started the calamity of 3rd yea | |
| Male protagonist. Transferred to Yomiyama North Middle School into 3rd year 3rd Class, but had to be hospitalized right before the beginning of the school year. | |
| Yūya's half sister. She attended Yomiyama North Middle School during 1983. | |
| He is a Yomiyama North Middle School student of 1983s 3rd year 3rd Class. He claims to have stopped the calamity that year, 1983 was the only recorded year were phenomenon stopped | |
| The father of the male protagonist. A college professor doing research in India | |
| Classmate and one of the class delegates, she is one of the 'Death's of May'. | |
| Adoptive mother of the female protagonist. Owner of the doll store. | |
| She is a nurse at Yūmigaoka Hospital and a good friend to the male protagonist. She has a younger brother in the same class as the male protagonist. | |
| She died shortly after giving birth to the male protagonist | |
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