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 sulking in the bath-tub a mysterious, nude girl, appears out of nowhere. Her name is Lala and she comes from the planet Deviluke, where she is the heir to the throne. Her father wants her to return to her home planet so she can marry one of the husband candidates, but she decides that she wants to marry Rito in order to stay on Earth.
This anime has some good ecchi scenes. At some points the love-romance story developes really well.
Its biggest flaw is the repetitive and often predictable humor
and humor was the main reason why I started watching this show.
What surprised me was the ending. Unlike most comedy anime it had a good, fitting end.