I like the story, except for the first ML, the first dude to appear. His obsessions with lolis is just too pedophilic for my tastes and ruins what could have otherwise been a good manga.
In Rosario Vampire there's a loli love interest but it doesn't ruin it because the girl's affections clearly aren't returned and it just makes it look like the girl is the perverted one jumping on a guy several years older who is uninterested.
But in Ghost Girl, it's not the child doing the unwanted perverted stuff, it's the older person! It just makes it soo uncomfortable. And I'm pretty sure he's the main ML so I can't even hope he'll be written out of the story.
I'll continue reading because I liked R+V and the art here is great, but this manga has a lot of flaws it needs to make up for.