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While her husband's parents are traveling,'Hina' is supposed to take care of her grandfather-in-law'Masa-ji', but the care of Masa-ji, a dignified old man, is not straightforward. Masaji attaches to such a chick and demands erotic acts in the name of long-term care. Hina, who is left to the desire of Masaji, will soon be drawn not only to her body but also to her heart.