I really like this single. Makes me really feel like the girls are coming together as a group.
All the girls have become reliable members, it amazes me how much Kana has changed from the dopey little dancer to who she is now. Same with Ayacho and her singing, few years ago you wouldn't think Ayacho would be a lead but she is now.
(Deep) Pink and Black are the colors of their logo. While they have lost their traditional patch with their logo since Atarashii Watashi ni Nare!/Yattaruchan release, they have also incorporated their logo's colors since that same single.
It is a change they did and I like it since it still represents the group.