28-year-old office worker Misaaki is a kind and serious woman who secretly fantasizes about her brother while masturbating. Despite her reserved nature, she indulges in solo pleasure with a vibrator during lonely afternoons, longing for intimacy. Her life takes a turn when a well-endowed male friend from college—now running a video-sharing site—falls for her at first sight. He confesses his desire to film her having sex, and though initially shy, Misaaki quickly becomes wet and aroused when faced with his huge cock. Left alone with him, she experiences intense, hard pounding sex after a long dry spell. Unseen by her, her younger brother watches the entire act, pleasuring himself as he witnesses his sister's ecstasy unfold.