One day, a mysterious letter 'F' starts to be written on doorplates in a condominium building. Since then, mysterious incidents consistently occur around Yukari Yamamoto, who is an ordinary female high school student living in the building.
2024
2007
1965
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2023
1978
1998
2014
1957
1939
2022
1981
2020
1986
1932
1968