Now this is just my opinion, but after watching the first season and eating up the mobile game, and seeing as the timeline seems to essentially be this:
There is a LOT of freaking time and context with all of the characters and their relationships with one another, that it very much seems like you would be missing out on far too much to just jump into the second season. Certain character happenings that I will spoiler in my thoughts of the first episode are a very huge leap and would benefit you greatly with the added context. So if you enjoyed the first season at all, and you can play the game in a language you know, I implore you to try it, because it really is so much better than the first season, and the second season... because of the extra characters, there is potential, but...
Episode 1 thoughts:
The animation is bad. Like, in Pastel*Palettes performance, really extremely hecking bad. It isn't ruining it for me because I truly care about the characters that much, and to see what they're becoming, I'm really happy for them. Happy lucky smiley, even.
All that, and I recognized O-tae practicing Poppin' Shuffle, that was great enough on it's own. Kasumi asks what she's playing, seems it hasn't been made yet! ?
The official subs don't go with the same translations of quirky catchphrases that the official English game uses. Kaoru's Feeting, Hina's Boppin', nowhere to be found.