I’m Shinji Ueda, a first-year high school student. It’s my first Christmas Eve with my girlfriend. But on the day of the date, she cancelled the date with me, and then unilaterally broke up with me. “I’m sorry, I can’t go out with an otaku because they’re creepy.” I was heartbroken after being dumped by my girlfriend, and Rika Matsumoto, a gal from the same class, appeared in front of me. Rika listened to my hurt story and encouraged me. Rika encouraged me by saying, “You. Be my lover.” Suddenly, she told me. Her true intention was to take revenge against… my ex-girlfriend. In fact, my ex-girlfriend had been having an affair with a boy in my class behind my back. “You and I are going to go out, and we’re going to continue our fake relationship. We’ll make love in front of your ex-girlfriend.” I teamed up with Rika to make my ex-girlfriend regret her actions, and we became fake lovers. At first the relationship is about revenge, but gradually I am drawn to Rika’s real side…. And Rika gradually became more beautiful, from a gal to a neat and tidy beauty. On the other hand, my ex-girlfriend realized after she broke up with me. Actually, the guy she ended up going out with was a scumbag, and I was better than him. But by the time she realized it, it was too late. I had become a true lover with Rika, and there was no room for my ex-girlfriend at all.