Naho was a successful volleyball player even before she got married. She retired after her marriage, but after a while, she found herself spending less time with her husband and more time on housework, so she decided to start playing volleyball again. Even though she was on a moms' volleyball team, she wasn't as physically active as she used to be, but with the support of her teammates and a kind coach, she soon regained her former stamina... but while talking to the coach about her worries, they ended up having an affair... and even during practice, she was covered in sweat and indulged in extramarital sex.