Nana married a coworker from her former company and now enjoys a happy life, but her husband still works there and is harassed by a jealous superior. That man, Otsuka, is Nana's former boss and a pervert obsessed with nipples. He wanted her when she was single and resented her for marrying his subordinate, so he plots to reclaim her. His sexual harassment targets the faithful wife's nipples until unwanted pleasure betrays both her judgment and her marriage. After repeated nipple orgasms, she is reduced to a compliant sex toy whose breasts can be fondled and licked before she is penetrated.