At the request of her father, who is currently on a mission overseas, Ayumi ends up taking care of her son Kyosuke, who is aiming to become a professional shogi player, as a housekeeper. Kyosuke, who had no time until the pro-am game, had no food or sleep, and as a result he practiced all the time, lost his concentration. "If things continue like this, I won't be able to transfer to a professional again this year. "One day, Ayumi wears a short skirt next to Kyosuke, who is practicing, and cleans her. Then, when Kyosuke witnesses Ayumi's flickering panties, he regains his concentration that he should have lost...