Nana, Momo, and Lala run away from there home planet because they refuse to marry Gid's best friend Tajo, king of planet Joi-fa, they end up at the Yuuki household. will Tajo's Alien assassins kill Rito and his sister Mikan and take Lala and her sisters back to there home planet? or will Rito and the stranger from a yet unknown planet save the girls from a unwanted marriage?