Naho, a full-time housewife who is doing housework for her beloved husband. One day, Naho asks an electrician to repair the kotatsu, which is out of order. After several tens of minutes, a strange feeling begins to grow in Naho's heart as she looks at the crotch of the electrician who is working under the kotatsu with his lower body thrown out. And, dissatisfied with the night life, Naho involuntarily straddles his crotch. From that day on, I became obsessed with the charm of the cowgirl position where I took the initiative while riding a horse.