As George said...it's a big surprise for me....O_O.... I guessed for a consolating ballad but it turns out to be sth. really different...lol. It still sounds so Kalafina-ish with the mix of feelings from many previous songs... really think of Magia and sth. faster like Progressive and Kyrie.
The song itself is a kind of...mixing...mixing so many stuffs together.... (and coz they're the stuffs I like, it turns out that I like the song so much.) I feel the big contrast between Hikaru's energetic&fast verses and slower&smoothier Wakana's&Hanae's part. It would be nicer if it can be splitted into two different songs. (I prefer Hikaru's&Keiko's section. Wakana's hook is a bit blah...)
So much Hanae.... but I feel that her calm voices is quite out of place...it's a big contrast as I said.. I may prefer solely Yuriko or Wakana herself. (But if Hanae's lines were picked out with some proper parts of melody&mixing, I bet that it'll be a good Kajiurago track.) IMO, what I don't like is the singing of the girl themselves. Their voices sound not that full. Wakana's quite-high hook sound too strain (just like what I feel with her recently singing for Kalafina in TTB, Manten, Yane no Mukou Ni, etc.) While I think that Hikaru would do better if her part is slower. They sounds really good in the (slower&lower) bridge. (and the bridge really make me think of Adore now.)
The endings sounds so random, but I love it....Hikaru's part really reminds me of 'The Battle is to the Strong'.

(BTW, I believe that she'd sing better if it's slower.) The instrumentals sound so awesome. It must be epic at live...:). Even each of them sounds, like the song structure, quite random and doesn't blend well.
Finally decided to pre-order....my money...Orz. I guess that this will be another Manten-issue for me... I don't like the singing and the improper structure of the song, but really love the melody and all other ingredients....