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.
Marika Ito
Yukari Yamamoto
Seiko Ozone
Yuko Yamamoto
Kosuke Endo
Akari Yamada
Kōji Suzuki
Yue
Taichi Yamada
Hiroki Konno
