At the request of her father, Yuri ends up taking care of her son Hideo, who is aiming to become a professional gamer, as a housekeeper. Hideo, who has no time until the world championship, practices all the time without eating to beat the mysterious genius masked gamer Z. As a result, Hideo puts too much strain on his wrist, ironically causing tendonitis. One day, Yuri wears a short skirt and does housework beside Hideo, who is practicing. Hideo witnessed her panties peeking out, and strangely, her tendonitis has recovered...