Yuri was asked by a father to take care of his son Hideo, who is aspiring to become a professional gamer, as a housekeeper. With little time left until the world championships, Hideo practices around the clock, without meals, in order to beat the mysterious genius masked gamer Z. Ironically, Hideo puts too much strain on his wrists and develops tendonitis. One day, Yuri is doing housework in a short skirt next to Hideo as he practices. Hideo catches a glimpse of her panties, and miraculously, his tendonitis recovers...