Newly hired as a part-time worker, Jun Suehiro appears young at first glance, but is actually four years older than me and already married. I coincidentally went drinking with her, as she was having trouble in her marriage, and we gradually became close. It's unclear who made the first move, but we ended up having an affair. Even after sobering up, the passion we ignited couldn't be stopped, and we continued sleeping together repeatedly. Unsatisfied with just having sex at home, we secretly met and made love in the store's backroom. My coworker Rin seems to be catching on to our relationship, yet I still can't bring myself to end this affair with Jun...