龍の谷と太陽の砦 (Ryuu no Tani to Taiyou no Toride)

Background
"Ryuu no Tani to Taiyou no Toride" is an original song by Ishifuro featuring Fukase. This song is an official demonstration song for the  VOCALOID4 Library Fukase.

This song is featured in the Fukase compilation album, VOCALOID Fukase ~THE GREATEST HITS~.