Show is pretty much a remake of Urusei Yatsura, with a less likable alien chick.
I remember the manga showed the alien chick's thoughts and she was just doing the dumb blonde act to manipulate people. Don't know if I misremembered or they just decided to get rid of it for the anime. They might have thought dumb was preferable to bitch. Too bad they wound up with dumb bitch.
Not nearly as good as Kanokon.