Naota's just your ordinary kid, he's got an essentric father and grandfather, he's got a brother away overseas to play baseball, he's got his brother's girlfriend hitting on him and perverted friends. And then one day, he gets run over by a yellow vespa, hit over the head with a guitar by a strange woman who turned out to be an alien. After this, everything spirals out of control. Robots start popping out of Naota's head and one of them even ends up living with him. And somehow Haruko, the female alien, worms her way into his household too. Naota may not be so normal anymore.