Yonagahime 3+1 (『夜長姫3+1』), also known as Yonagahime or Yonaga' among fans, is a former singer/idol group in post-war Japan. It consisted of three members, but the group's promoter made up a fourth member, Eri Anzai, who was allegedly killed in a terrorist attack. Eri Anzai did not exist, but her (recorded) voice was An Osada's.
Members[]
 |
 |
 |
| Yumeno Zawayume | Kumi Tsunemi | Sumika Nakahashi |
|---|---|---|
 |
 | |
| Eri Anzai | Hisako Osada (manager) |
[]
| Song of the Heartless | Correlation | |
|---|---|---|
| Victim | Hisako Osada | 
|
| Culprit | An Osada | |
| Other | Yonagahime 3+1 = Kumi Tsunemi + Yumeno Zawayume + Sumika Nakahashi Toshiji Aramaki • Arata Oyamada • Eitaro Nakahashi |