I've listened to preview many times on the yesterday evening and I'm listening to now since several minutes. I have to say that I LOVE THAT SONG already. Even it's only 15 seconds. Even if other parts would be bad in full song for me, I love this now. Kind of unique and different from Ayu, but still the same, old and good Ayu.
And that part of lyrics... OMG so beautiful. <3