Sumika, a married woman, struggles with the emotional and physical distance in her sexless marriage to her husband Kaoru, department chief at Yamashina Products. Her life takes a dramatic turn when she begins confiding in Sato, a male temporary worker. Drawn to his muscular, masculine physique, Sumika is irresistibly taken by him, overwhelmed by pleasure she hasn't felt in years. The intense sensations reignite her suppressed desires, awakening a passion she can no longer control. Her body craves penetration again and again, marking the beginning of a new, illicit romance filled with cowgirl positions, bukkake, and facials.