Ultra Maniac
 

I know it's from the same author of Marmelade Boy, which is a series I liked a lot. I was wondering if it's the same kind of romantic story. The fact there's magic involved doesn't sound too convincing if it's really a bit like Marmelade Boy.

Is there anybody who can tell me what this is really about?

When I was young I liked Marmelade Boy too. Not one of my faves, but it was ok to spend some time. Ultra Maniac is boring. The magical girl's stuff is silly, it's very incoherent, and the plot is weak. I wouldn't recommend it, if you have other choices.