Yumi, a married woman for ten years, has seen her intimate life with her husband dwindle due to his overwhelming work schedule. Lately, she often finds herself alone on the sofa, indulging in masturbation. One day, her husband invites his young subordinate, Tanaka, over to their home. Engaging in conversation with a younger man for the first time in a while, Yumi can no longer suppress the stirring emotions deep within. When her husband steps out, she impulsively leads Tanaka into the bedroom. In the quiet of the night, their warm, intimate encounter brings her a satisfaction she hasn't felt in years.