Beautiful release!!
Firts, KNIFE : it's a pretty song BUT I don't love it so much... I think it's not very inspired, and there's no many originality.
Mirror : The song I prefered in this single. It's amazing, fantastic, wonderful! The long passages are intriguants, full of mystery, they gave me envy to know what will take place in the song later, because we can suspect by listening that something'll happen. In effect: a heavy passage leaves place, It gives shiver and it's wonderfully fretful. Jyou's voice is just perfect. It's a song very original and amazing!
Liquid (retake ver. 2010) : I prefer this version! I gave me shiver too! Waw, the intro is just amazing, it's so melodic and beautiful! I had the impression that the song was even darker than before, and I like it! Moreover, the duet Miko/Jyou in the middle end of the song is wonderful!
In conclusion : KNIFE => Can do better
Mirror => Perfect.
Liquid => Better than the one & wonderful.