Chihiro is a second-year high school student. He is somewhat impatient because he has no girlfriend, even as Christmas approaches. One day, while browsing the internet on his mobile phone, he discovers an interesting website and downloads it. Upon completion, his phone suddenly flashes, and a tiny girl appears before him. "I'm Rin. What's your name? You have no girlfriend, don't you? I'll be in trouble if I don't make you happy." She explains that if he fails to find a girlfriend before Christmas, she will be unable to return to her world. Will he manage to find a girlfriend for himself and Rin before Christmas...?