The characters are so one dimensional. Being one dimensional isn't even the worst part because it's actually fine for a character like Jan Poo (Jump?) to be one dimensional. She's really cute that way. But main characters mustn't be so simplistic! There are even characters like Tsuki-sensei who fails at the simplest task of being a comic relief. All she does is to fall, literally!
Thankfully, the art is pretty and cute. That's the only reason I'm continuing to buy the manga. Well, manga is also cheap, and I do enjoy the internet radios (two of them), and I don't believe in free lunch.
