いつかこの火が消えるなら (Itsuka Kono Hi ga Kieru nara)

Itsuka Kono Hi Ga Kieru Nara is a song sung by Miku Hatsune with Rin Kagamine doing the chorus. It is the two-hundred-and-twentieth track and the two-hundred-and-twenty-first track in Other Vocaloid Songs 151.