Shimotsuki Haruka - Arcadia. From Atelier Series Vocal Collection - Volkslied 3.
Nice vocals just like all her songs combined with nice tones just like all Atelier songs.
The Mexashare links for parts 2, 3, 5, 7, 8, 10, 11, and 12 are dead.
The Rosafile link seems to be online, but for I can't download it.
Additionally, I can't download the file from KatFile or Rapidgator either.