Just watched, and I liked it ! Not as good as Resonant Blue, but way better than I expected when I heard it was going to be based on an old song.
What I really liked was the beat and the arranges (I think that's the word I'm lookign for) that make this song.
They're all beautiful in the PV but I thought Eri was amazing, and I like the fact the Ai's hair got a little longer.
Another thing I liked that's nice to note is that this time, thankfully, JunJun isn't simetricly ooposite to LinLin in the moments thay appear during the PV. I mean, they both joined together, sure, but mixing their positions givis the songs a different look !
Maybe an exemple will make you understand what I'm trying to say, like the time when Tsuji and Aibon always appeared together, not a problem, but EVERYTIME ? It get's weird after a while, after all, they are all a group, not a duo the joined a group.
Overall, really nice song, and catchy.
PS: Loved sayu's ending line !