Good but not strong single
The cover is really beautiful and even though there are 13 people, it doesn't feel crowded. Regarding the songs: Seishun is definitely a grower, at first I didn't care much about it, now its by far one of my favorite post-Aichan songs, specially when you watch the another ver.
Yuugure from MM'15 is what TokiSora was for MM'14... a breeze of fresh air, between all the EDM is nice to have a ballad. Loving the Maachan focus even though she is in my bottom 2. Also great vocals from Sakura and Mizuki. I think Riho sounds a little out of place with her solo line.
Ima Koko Kara is the weakest song in my opinion but its still good! Maybe is because its not that catchy, but the fact that is a Saku-Riho lead made it interesting after all this years been all about RihoRiho (who i love) and no one else.
Cute aesthetics as always and great vocals.
I think is a good single but as 12th gen debut single, the first as MM'15 and without Michishige Sayumi, my expectations were the highest and unfortunately the single was not even close.
In the end I think is a good single and you should have it more for what it stands for (new era, 12th debut, 1rst not Sayumi) than because of the songs.