Rinko works as a telephone counselor. Her husband is a workaholic with severe mysophobia. Although there is no sexual pleasure in their marriage, they still look like a happy couple. On a humid and uncomfortable day in June, Rinko received a strange letter with the words "your husband's secret" written on it. In the letter, she found many photos of herself masturbating. In order to get the photos back, Rinzi has to obey the mysterious man's request, and her comfortable and familiar life will gradually collapse like a house made of cards.