I figured another review would be helpful, so here's mine: I watched this OVA after I'd already finished the main anime. (And as I'm playing the mobile game.) Seeing a "return" to 2D animation was nice, but unfortunately, the animation of this specific OVA is very low quality. A shame, when S1 of BanG Dream! stood out for its pretty animation. The 3D is equally bad as it was in S1, so... that's pretty unfortunate. This is a short, plain "beach episode". There is no story to speak of. The girls wear cool looking swimsuits, but I'm not sure I needed to see angles specificallyplaced behind their butts, especially not at their age. Roselia are here and in 2D, whereas I'd only seen them in the 3D-animated seasons before, so that's cool. BanG Dream! usually manages to tell sweet stories, even for such small events as "going to the beach together", but this one is extremely bland. Their interactions seem very forced, which is unusual for the series.

It's a quick watch, so I think it's very inoffensive, but as a fan of BanG Dream! who usually thinks PoPiPa is extremely endearing, I have to say they gave us nothing in this specific OVA.