Hmmmmm.... What to say about the preview:
Ummmm... Momo's high notes are lovely (Momo's vocals seem to be at their best here! XD), and Airi & Miya's harmonies are also lovely!! <3333
The PV looks nice, it suits the song very well, and the outfits look nice too (The girls look like angels in those white dresses! xD)! The song reminds me of Take It Easy to some extent... Both were summer songs, and both were sort of "calm" and "relaxing"... Although in my opinion, I think Natsu Dakara definitely pwns Take It Easy (I find the melody to be catchier).
Take It Easy took a good while to grow on me (I think it took like 2 months or something? The country-ish feel to it, was very off putting to me.... I don't like country music... :P), I liked Natsu Dakara though the 2nd time I listened to it! When I 1st heard it, I thought it was just "OK...", the 2nd time I thought it was pretty good though. :)
Oh, and btw, Momo is not the only member with solo lines in this song, Airi & Miya also have solo lines, the solo lines in the chorus go to a different girl each time.
It goes like this:
Miya-> Airi -> Momo