>>3189850The general plot structure of the part of the story that's being adapted into the anime is an ascending rookies story like you'd see in sports anime. The story has a lot of focus on the fans, the media, and industry drama and it really starts to revel in the last one later on. It's far from the only idol series to do those things, but it definitely isn't just "whoo we're dancing and singing and happy and beautiful".
Pic related was the promo image for the most recently released part of the in-game story (which would likely map to season 3 of the anime, if it gets that far).