Rie and Shota are a married couple celebrating their third year together. Meanwhile, Jun, Shota's cousin, lost his wife in a traffic accident a year ago and has since suffered severe emotional and physical trauma, leading him to quit his job. Concerned for him, Rie, who works as a case worker, worries about his well-being and suggests a change of environment. As a result, Jun begins staying at Rie and Shota's home for a while. Living under the same roof again, Jun becomes increasingly stimulated by the presence of a woman, awakening intense sexual desires he can no longer suppress. However, Jun confesses to Rie a painful truth related to his wife's death, driving their relationship into even deeper complexity.