Mayu lives with her husband and his disabled father, who requires constant care. She feels self-conscious about her nipples, to the point of hiding them even during intimate moments with her husband. As their marriage grows increasingly strained, her father-in-law overhears one of their arguments and, pretending to be a lingerie thief, secretly takes her bra. From the next day on, Mayu is forced to care for her father-in-law without a bra, pushing the household into deeper emotional and physical tension.