紲月歌 (Setsugetsuka)

Background
The song first appeared as a demo on Vocalomakets' official website. Later, Bumpy uploaded the full version onto NND on December 22, 2011 and has since gained more than 300,000 views, thus putting it in the Nico Nico Hall of Fame. Bumpy also uploaded the song onto YouTube on December 25, 2011.

This song is featured on the album Tsuki no Hibiki.