This show gave off a huge "mediocre" feeling. I've been thinking on what to say about it, but there's just not that much to talk about. Almost everything about it has been seen a thousand times before, in most cases better.
Basically, the show is about a girl who suddenly became the right hand of the guy she has had a crush on for years... Hold it right there, keep that feeling, because thats where the originality ends. The show consists of scene's with the super-violent sister picking on the guy, lots of ecchi scene's, all of which were mediocre at best and lots of shallow humor.
Still, the show wasn't terrible, I've seen a lot worse. It's just not something I'd recommend to anyone, seeing there are so many, much better alternatives.