To Love-Ru (2008)
Original Title: To LOVEる -とらぶる-
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.
To Love-Ru - watch online: streaming, buy or rent
Currently you are able to watch "To Love-Ru" streaming on Hulu, HiDive or buy it as download on Apple iTunes.