Ai Sayama delivers a powerful performance as a married woman who, while loving her husband, is overwhelmed by her own desires. While caring for her older husband, Taro, who is suffering from illness, Ai repeatedly seeks sexual fulfillment, but their intimacy continues to fail due to his condition. Into their lives comes a new presence—Ida—who is hospitalized nearby. One day, Ai discovers Ida masturbating, creating an awkward and tense atmosphere. However, driven by mounting sexual frustration, Ai ends up performing masturbation using her husband's hand. That night, Ai visits the sleeping Ida's bed, setting the stage for a new and intense development.