I live here. Seriously, I do. Whenever I go to the mall, I'm completely absorbed in Hello Kitty and all her cute, little friends. I'll be there for hours on end until someone comes to pull me out or I've looked at everything at least seven times.
It's a little expensive, but bear in mind that lots of this stuff is from Japan and is pretty much only available at other specialty stores.
If you plan on moving into this magical shopping Wonderland as have I, prepare to be on cloud 10.