G-Mode Archives 23: Keitai Shoujo

The main character, Hiroshiro Aida, is in the second year of high school. It's almost Christmas, but I can't have a girlfriend this year, so I'm feeling a little immetied. When I'm surfing the Internet on my cell phone to kill time, I found a site called "Gal☆Mo~do" that I was a little curious about and downloaded the standby screen. When the download is over and the "Done" is displayed, when the mobile phone terminal emits intense light, There was a small girl sitting there that was enough to sit on the palm of her hand. "I'm Lin. How about you?" "If you were able to download me, do you have a girlfriend by any chance?" "I'm a little troubled if you can't be happy by Christmas. I don't have time, so I'll explain..." Saying that, Lin tells her that if Aida doesn't make a girlfriend by Christmas, she won't be able to return to the original world. Can you make her by Christmas to become the main character and safely return Lin to her original world?