It seemed like a really interesting manga. It has a nice artstyle, I like the characters and their backstories and the world is interesting, but I dropped this due to one really big reason, the cringe.
I know I had high hopes for this, perhaps too high, but I'm used to disappointing manga. When I heard that they defeat the enemies with music, I thought it was a translation error. The fact that they defeated their enemies by singing and that they have magical girl transformations, were extremely cringey, and I just couldn't read more.
If you're not turned away by that, I recommend you read it. I'd definitely read it if the fighting or the antagonists actually made any sense.