Himari (blue hair girl) hard carry this show, and there's nothing else to it.
I will keep this review short and informative. Himari is the only hard carrying in this show to kept it out of a mid rom-com anime. She's one of the better female MC in a rom-com character in a long while (since Megumi from Saekano how to raise a boring girlfriend). The dept to her character is very interesting, and the studio directing, writing, animations, and voice acting portray her perfectly. Everyone else in this show so far is very generic rom-com character that you would found in any other rom-com anime.
Her character have ups and downs. Imperfections we can see and really "show not tell" well by the directing and its moments. Her dere-dere personality, while also being a bit tsundere, and show her weakness, confusion, and anger, is a breath of fresh air in this genre for a while.
The gimmick, while is not new, is pretty much the first time to be the main point of the show, and that can be interesting. The show also keep the relationship developments very hard to guess, and always twist and turns unlike normal rom-com (in term of predictability), so that's an up for many people.
In term of other aspect, it's ok for a rom-com.
Directing is pretty ok in general.
Pacing is on the faster side but not that fast, which works well with the comedy style.
Animation is pretty ok and on the better side and works well with the directing.
Writing is ok albeit sometime questionable with it jokes, requiring some niche knowledge for the 5th wall breaking the MCs is making, but overall fine.
Sound directing and OST is fine and work wells.
Overall, just like I said, you either gonna love this show or hate it depending on how much you like or dislike Himari, and how tolerable you are to some of the other character actions and writing.