They introduced most of the main characters and Asuka seems to be amusing one to look out for while Reina gives off a very cool air around her. OP song is decent with colorful and upbeat tone. Then, there's also the music theme and a bit of friendship going on around among the girls...
It was overall fine but I hope they can take the story a bit further beyond just music. Think they got most of the introduction parts right though. And ED song seems alright as well.