Hana, a big-titted housewife in a dual-income household, worked full-time five days a week plus an additional part-time job. However, she secretly maintained a hidden relationship—every day after her part-time shift, she was summoned to a public restroom without her husband's knowledge. A middle-aged man who called himself "manager" lured her out, seducing her with promises of a higher hourly wage. The acts carried out in the station bathroom gradually led her into pleasure and dependency. While her husband happily believed her rising income was due to a raise, Hana was, day after day, being mentally and physically corrupted by the repeated encounters.