Riko (not her real name), wearing an apron with cute appliques, is a nursery teacher and a kind young lady who brings homemade cookies to the workplace as a souvenir. She is loved by the children, and her simple atmosphere and plump body, just like when she moved to Tokyo from the countryside, make it seem even more so. When she masturbates, she says that for some reason she can only use her favorite electric massager occasionally, but what could that be?