FrostburnPhoenix: How about the scum are evil bunny hand puppets called yoshcubators who take over the bodies of anime girls because they are ashamed at how small they are. At night, they turn anime girls into lolis out of spite, which makes them useless. Of course the anime girls fight fire with fire and borrow the power of the goddess Mayoi to turn those they suspect have yoshcubators within them into lolis as well. (The yoshcubators flee in shame when seen in such a small body.)
Probably could use some work but at least it's an idea.
I like the sound of that. Good magic versus bad magic. They probably gather in a school in their regular uniforms and accuse each other of being...nah this needs a bit of working out. Does it have to be a school magic? In which case it's Harry Potter with extra Japanese Anime steps...yes needs thinking through.