I am Shinji Ueda, a first-year high school student. On my first Christmas Eve with my girlfriend, she stood me up and broke up with me, saying, 'I can't be with a nerd.' Heartbroken, I met Rika Matsumoto, a gal from my class, who comforted me and proposed to become my girlfriend. Her true intention was to get back at my ex-girlfriend, who had been cheating on me. We pretended to be a couple to make my ex-girlfriend jealous. As time passed, I began to be drawn to Rika's inner beauty, and she gradually transformed into a pure beauty. Meanwhile, my ex-girlfriend realized that the guy she chose after breaking up with me was a scumbag, and I was actually better. But it was too late, as Rika and I had become a real couple, leaving no room for my ex-girlfriend to come back into my life.