This should be the new introduction:
The story is about Yuuki Rito, a high-school boy who cannot confess to the girl of his dreams, Sairenji Haruna. One day when coming home and fapping in the bath-tub a mysterious, nude girl, appears out of nowhere and lands right on top of his erect penis just before he ejaculates, and ends up impregnating her. Her name is Lala and she comes from the planet Deviluke, where she is the heir to the throne. Her father hears word of the incident, and sets out to kill him in order to retain as king, but Lala disapproves this and marries Yuuki in order to save him and stay on earth as a family.
What does Anon think?