Keitai Shoujo: Triangle Spirits

A second-year high school student, Chihiro, is eager to have a girlfriend, especially as Christmas approaches. While browsing the mobile internet, he stumbles upon a website and downloads it. After finishing the download, his phone suddenly flashes, and a small girl named Rin appears. She explains that Chihiro must find a girlfriend before Christmas, or she will be unable to return to her own world. Rin claims she will struggle if Chihiro remains unhappy. The story explores whether Chihiro can find a girlfriend in time for both himself and Rin.