Inspite others have mentioned almost everything, I really wanted to make my own review on Bocchi because at the end it became one of my favorite animes unexpectedly. (I wanted to watch a 'music anime' and it just happened, like how Birdie Wing got me which I didn't expect from a sports anime at the first place.)
Bocchi The Rock offers everything to be a great show. It starts slowly so you have to be patient and bear with Bocchi's character, because she is a borderline annoying introvert. Not saying she is unbelievably portrayed, but the way she is... well, that's the way she will be till the end, more or less. I would have given this show a 10 if she had been a bit less of an annoyance, but I understood the artistic exaggeration here, so for me it was okay. Maybe, not for you, check the first few episodes, she will change, but not too much. (At least she won't perform in a card box and becomes able to stand in front of a large audience which is a great achievement, now that I think of it.)
But then the other characters of the band get introduced and they are all lovely and provide a constant source of wholesome fun. And then they start playing music which is the real deal! In episode 5 they perform on stage which is super dope and the show starts to show its true merits. Later they perform in episodes 8 and 12 and it gets more and more awesome, I have watched episode 8 a few times because that's really the climax of the story.
So, yeah, there is definitely a nice story arc in the show and it's nice to see as they get together as a band, caring for each other and getting better and better by each episode. The in-between episodes do not feel filler at all, every single one tells a correct story. I would have appreciated a little bit of more drama and a less annoying Bocchi with some real changes in her personality, but it's great the way as it is and maybe I'm asking for too much. Music plays an important part of the show and it truly shines in that department! Kessoku Band has even released its real album which sold pretty well, check it out, cos it's good.
(Don't expect romance or yuri content here, even though there is a small hint in the beginning when Kita is joining the band - maybe in Season 2? Btw. The drunken girl was my favorite. Anime doesn't shy away to show some bad examples, does it? My soul mate.)
