This song is one of the most complicated Vocaloid duets to sing, for it requires at least two people, different lyrics and melody, which makes the song more unique. The single album "Yumemiru Kotori" was released on KarenT to celebrate the Kagamine Rin/Len Append's first anniversary. Also, in June 2009, the song was available in JOYSOUND, and it is featured in the EXIT TUNES compilation album Vocalostar.