SUMMARY: Nozomi is in one of those so frequent japanese sexless marriages (for once, truth in hentai: https://japan-forward.com/the-sun-also-rises-japan-confronts-a-crisis-of-sexless-marriages/), with her husband ignoring her too busy with his work. When she finds a soapland card in his suit she consults with a friend, who recommends her a beauty parlour offering sexual massages.
She rejects the idea; but some time later his husband brushes off her obvious advances and Nozomi finds another card dated on the same day...so she finally goes for it.
To her surprise the masseur turns out to be an old classmate, who back on high school when Nozomi was still quite plain was one of the most popular guys...
One of those cheating stories that feel very vanilla, since the masseur isn't some scumbag, and her husband is actually also cheating. It's almost certain that by the end of this story, she'll get divorce and happily get together with the male lead.