At work, Yuuka, a housewife who was inconspicuous and didn't stand out, was timid and couldn't refuse even when her boss forced her to do unpleasant tasks. Yuuka experienced harassment on her daily train commute, where her nipples were relentlessly toyed with day after day, making them more sensitive without her realizing it. Eventually, despite being harassed, she found herself getting aroused by her nipples to the point of incontinence.
