Kobayashi was captivated by the sight at first glance. On this day, when he came to play at his friend's house, Kobayashi saw his friend's mother, Chisato, in her underwear in the bathroom. She's beautiful but wears such ugly underwear... It's purely functional and has nothing to do with fashion, a large bra. But for Kobayashi, who had never harbored fantasies about women as a virgin, this was the first time he saw a real woman's figure. Since then, Kobayashi started stealing Chisato's underwear whenever he got the chance. And before long, he came to think that there was no one else but Chisato who could be the one he loses his virginity to.
