Those who have read the manga: is this a good prequel?

jonnemummiska said:
So, as the ”Zero” in the title suggests, this anime is a prequel to a manga called Ga-Rei where Kagura is a central/main? character. I was surprised to learn of this, cause it doesn’t really feel like a prequel to me? Honestly it feels like Kagura already had her full arc, so it’s kinda hard to imagine how to connect another one without it feeling diconnected, which is why I’m asking