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Luna moves to Tokyo for a summer course at a prep school and ends up living alone in a guest house. However, when she arrives there, she finds a large amount of garbage scattered in front of her neighbor's door. When Onii Shimonuma, Luna's dirty brother, hears Luna mentioning the smell of garbage, he turns the tables on her and abducts her. Luna's slender body is no match for the power of her brother, who has trained her through continuous ejaculation masturbation, and her mind and body are dominated by her abnormal sexuality....