Naota is an ordinary male 6th grade student with a bit of a problem his brother left behind when he went to America-his homeless 17 year old girlfriend Mamimi. If things couldn’t get worse than having his brother’s girlfriend using him as an outlet, he also has a girl named Haruko who claims to be an alien from outer space chasing after him for unknown reasons. Now Naota has to find a way of dealing with his relationship with Mamimi while dealing with the insanity of Haruko’s outrageous antics.