Ayumi was asked by her father, who is working overseas, to look after Kyosuke, a son aspiring to become a professional shogi player, as a housekeeper. With little time until the pro-amateur match, Kyosuke practiced around the clock without food or sleep, and as a result lost his focus. "At this rate, I won't be able to transfer to the pros this year either." One day, Ayumi was cleaning next to Kyosuke, wearing a short skirt. Then, when Kyosuke saw Ayumi's panties flashing, he regained his lost focus...