Chisato Natsume, a vision of summer in her tiny bikini, finds solace in the privacy of her room. Her hands roam, caressing her luscious body, as she imagines a thousand stones of pleasure raining down on her. Her fingers find their way to her soaking slit, rubbing and teasing until she's a quivering mess. Suddenly, her mother bursts in, catching Chisato in the act. Embarrassed, she tries to hide, but her mother, with a sly smile, suggests they continue together, leading to an unforgettable mother-daughter bonding session.