Of course, please support the artists and buy their stuff if you like the music. :3
(mods: if this is not allowed, feel free to delete the post ^^)
EDIT: Here are the links!
Kokusyoku Sumire - Tenkirin Kumikyoku (2007).rar
Kokusyoku Sumire - Zenmai Shoujo Hakoningyou (2004).rar
Kokusyoku Sumire - anderu meruhen koushinkyoku (2006).rar
Any problems, let me know!