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Yu, a wife who has been married for three years, is living a harmonious life as a married couple even though she feels a little unsatisfied with her indifferent husband. One day, her brother-in-law, Kensuke, who is an exercise trainer, visits her house. Recently, Yu has been concerned about the sagging of her body, and with her husband's recommendation, she decides to receive some guidance... However, unlike her husband, Kensuke, who is a carnivore, is excited by Yuu's huge breasts from the moment he laid eyes on her, and plays with her voluptuous body in the name of guidance. Eventually, she can't resist the sensuality seeping out of Yuu's flushed body and grabs her breasts...