What do you think?
OK, so I listened to it once when you first posted & once more just now, just to see if my feelings have changed about it. In short, I'll say this:
Personally speaking, I think that "Amegari no Yuushi" is one of those song that might be an acquired taste. It might take several times of listening to it to get the feel of the melody itself than to get the feeling of how Kyo & ToshI sing, you know? Listening to it at first, I had a feeling of not being satisfied that I couldn't really explain (maybe I had put it up to be the greatest thing ever in my mind, haha), while on the second listen the song grew on me a little bit. On some parts it seems like Kyo's voice overpowers ToshI's, but they do blend together pretty nicely on most parts since Kyo is singing somewhat more deeply in comparison to ToshI.