That version which can be heard in Kara no Kyoukai: Epilogue is simply enthralling and breathtaking. More beautiful than After Eden/Magia version. After Eden ver. is great too but if someone love this song, must hear the KNK's version. (altough the name of that is "snow is falling")
This one sounds much better in the context of After Eden than after Magia. Now I think this song is good, middle part is really great. But Wakana's vocals in the beginning and near the end ruins the song.