Married for three years, Eimi Fukada feels a quiet emptiness despite her seemingly stable daily life. One day, after losing her house key and standing helpless, she is pulled into her neighbor Saku's reclusive home. Unbeknownst to her, Saku has been secretly eavesdropping on her household and is fully aware that Eimi is dissatisfied with her marriage and suffering from chronic sexual frustration. Confronted with this truth, she is forcefully overpowered. Though she resists at first, Eimi is overwhelmed by intense sensations she hasn't felt in years, awakening forgotten pleasures and plunging her into a whirlpool of conflicting emotions.