Genda Riku is an admitted geeky otaku and Yara Ai is a friendly popular girl in class. By chance, the two discover that they are deeply addicted to the same game and hit it off. They become close friends and go shopping together to buy merchandise but Riku thinks that this is just the closeness that is unique to Ai's gal personality. One day, they suddenly go into a love hotel to take shelter from the rain and the two end up having sex. Riku thinks that this is also something that she would do with anyone because she is a gal but is stunned to hear that Ai was a virgin. "Yara-san... you're not a gal?" Hearing this, Ai decides to aim to become Riku's ideal 'sexy gal'.