Yoku no Tatemae

Overview

Everyone uses their true feelings and their public image differently. Although she is dissatisfied with the sex she has with her boyfriend, she still loves him. Still, the question that crosses her mind is, "Am I going to die without ever having good sex?" Honoka, an office worker, suddenly makes a passing desire come true. It's a purely physical relationship. "This isn't love, so it can't be helped," she thinks. However, Honoka's boyfriend is also in a public relationship with another woman... A modern human drama about true nature, where love, sex, and calculation intertwine. (Source: Nihon Bungeisha, translated)

Source: AniList