^ Thanks for the vid
First, the intro is making it sound like Spanish Dance songs (Even her dress almost matches the style). In fact the whole song somewhat Spanish to me lol. I have never thought this song can be arrange like this and still pleasant to our ears. I liked the guitars very much. A surprise to me here.
Then its Minori's voice, I don't know if she deliberately do this or its actually her normal voice, she sounded especially flat & 'compressed', like voice acting an anime. I don't like that especially its backed by guitars, making sound even more weird. With acoustic guitars I think I am expecting a more natural, rounded voice for this and Minori just somehow got it wrong (in my mind).
That said, as already mentioned above, she is well-prepared and still shows her usual stability in performance.
After last year with Kalafina and 06' with Chiaki, it just feels weird. Its not like its lacking power (Hikaru really did it last year) or she's off pitch or sth. She just doesn't blend in. It was a fresh idea making it acoustic, but it wasn't well executed.
PS: I noticed she wears IEM, maybe Kalafina should do this every single live performance so they can improve their performance in terms of stability...