Straight from the sky,from another planet, and almost at the head of a young boy named Kazuya Watari falls Hin. Hina, the Guardian of Hearts, but it`s a secret. This is between us. And that after the previous mission had failed miserably. But we`ve got someone to defend the land. Well, except for this little girls, obviously no one. The plot is based on the eponymous sci-fi lyubovno-comedy manga Amatsu Sae. And you, in the anime, representing a sitcom waiting favorite fanservis and all sorts of adventures.