[Trance] Spiral Ladder by ZTS

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This song is the theme of Caren Ortensia from Fate/Hollow ataraxia remixed by ZTS, album Selfregards 2
(pretty hard to find!)
Unfortunately I don't know much about this series yet I adore this song.
Main part gives me chills and makes me feel like ascending to the heaven...
Enjoy! Don't forget to watch on high quality for stereo sound.