"It was 1999. What remained on that cassette tape was a familiar singing voice."
As told by MUSICIANS Fumiya Kuratsu (Seiya Konishi), who disappeared from the public eye,
A daily audio recording about "a certain song." A former band member obtains it.
Fumiya's hidden feelings are gradually unraveled by Sho Orihara (Seiya Inagaki).
A story of the burial and sublimation of youth, woven together across different eras.