At the request of his father who is on an overseas assignment, Ayumi becomes a housekeeper to take care of her son Kyosuke, who aims to become a professional shogi player. With little time left until the professional-amateur match, Kyosuke practices non-stop without eating or sleeping, resulting in a loss of focus. 'At this rate, I won't be able to turn pro this year.' One day, while Kyosuke is practicing, Ayumi, wearing a short skirt, cleans nearby. Seeing Ayumi's panties flash, Kyosuke regains his lost concentration...
