Tanihara Nozomi, the wife of the Tanihara household, agrees to let her brother-in-law, Kensan, stay for a few days while he prepares for a job interview. With her husband away on a business trip, she feels slightly uneasy at first. However, as days pass, she gradually lets her guard down during their time alone together. One night, after drinking alcohol and feeling physically sluggish, Nozomi gives in to loneliness and begins masturbating in her private room. At that moment, Kensan appears in the room. Overcome by the sight of Nozomi unlike her usual self, he loses all rationality and moves toward her.